diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index a7b45a3..2ee2851 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -140,9 +140,7 @@ function comment_entity_view(EntityInterface $entity, EntityDisplay $display, $v
     if ($field['type'] != 'comment') {
       continue;
     }
-    $values = field_get_items($entity, $field_name);
-    // @todo Field instance should provide always default value http://drupal.org/node/1919834
-    $commenting_status = isset($values[0]['status']) ? $values[0]['status'] : NULL;
+    $commenting_status = _comment_get_default_status(field_get_items($entity, $field_name));
     if (isset($commenting_status) && $commenting_status) {
       // Entity have comment open or close.
       $uri = $entity->uri();
@@ -963,9 +961,7 @@ function comment_view(Comment $comment, $view_mode = 'full', $langcode = NULL) {
  */
 function comment_links(Comment $comment, EntityInterface $entity, $field_name) {
   $links = array();
-  $items = field_get_items($entity, $field_name);
-  // @todo Field instance should provide always default value http://drupal.org/node/1919834
-  $status = isset($items[0]['status']) ? $items[0]['status'] : COMMENT_OPEN;
+  $status = _comment_get_default_status(field_get_items($entity, $field_name));
   if ($status == COMMENT_OPEN) {
     if (user_access('administer comments') && user_access('post comments')) {
       $links['comment-delete'] = array(
@@ -1214,9 +1210,7 @@ function comment_node_update_index(Node $node, $langcode) {
       $mode = $instance['settings']['comment']['comment_default_mode'];
       $comments_per_page = $instance['settings']['comment']['comment_default_per_page'];
       if (($items = field_get_items($node, $field_name)) &&
-          // @todo Field instance should provide always default value http://drupal.org/node/1919834
-          isset($items[0]['status']) &&
-          $items[0]['status'] && $cids = comment_get_thread($node, $field_name, $mode, $comments_per_page)) {
+        _comment_get_default_status($items) && $cids = comment_get_thread($node, $field_name, $mode, $comments_per_page)) {
         $comments = comment_load_multiple($cids);
         comment_prepare_thread($comments);
         $build = comment_view_multiple($comments);
@@ -1249,7 +1243,6 @@ function comment_node_search_result($node) {
   foreach ($comment_fields as $field_name => $info) {
     // Do not make a string if comments are hidden.
     if (user_access('access comments') && ($items = field_get_items($node, $field_name)) &&
-      // @todo Field instance should provide always default value http://drupal.org/node/1919834
       isset($items[0]['status']) && $items[0]['status'] != COMMENT_HIDDEN) {
       if ($items[0]['status'] == COMMENT_OPEN) {
         // At least one comment field is open.
@@ -2237,3 +2230,19 @@ function comment_field_delete_instance($instance) {
     cache()->delete('comment_entity_info');
   }
 }
+
+/**
+ * Helper to get default value for field.
+ *
+ * @param array $values
+ *   The field values array or NULL for field create with field UI.
+ *
+ * @return int
+ *   The value when exists or COMMENT_OPEN.
+ *
+ * @todo Replace with field default value after http://drupal.org/node/1919834
+ */
+function _comment_get_default_status($values) {
+  // We only ever process first value if any.
+  return isset($values[0]['status']) ? $values[0]['status'] : COMMENT_OPEN;
+}
diff --git a/core/modules/comment/comment.pages.inc b/core/modules/comment/comment.pages.inc
index 943b87a..3d4e48d 100644
--- a/core/modules/comment/comment.pages.inc
+++ b/core/modules/comment/comment.pages.inc
@@ -103,10 +103,8 @@ function comment_reply(EntityInterface $entity, $field_name, $pid = NULL) {
     }
 
     // Should we show the reply box?
-    $items = field_get_items($entity, $field_name);
-    // @todo Field instance should provide always default value http://drupal.org/node/1919834
-    $status = isset($items[0]['status']) ? $items[0]['status'] : COMMENT_OPEN;
-    if ($status != COMMENT_OPEN) {
+    $commenting_status = _comment_get_default_status(field_get_items($entity, $field_name));
+    if ($commenting_status != COMMENT_OPEN) {
       drupal_set_message(t("This discussion is closed: you can't post new comments."), 'error');
       drupal_goto($uri['path']);
     }
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/field/formatter/CommentDefaultFormatter.php b/core/modules/comment/lib/Drupal/comment/Plugin/field/formatter/CommentDefaultFormatter.php
index 0bbd2e3..e470a01 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/field/formatter/CommentDefaultFormatter.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/field/formatter/CommentDefaultFormatter.php
@@ -33,9 +33,8 @@ public function viewElements(EntityInterface $entity, $langcode, array $items) {
     $elements = array();
 
     $field = $this->field;
-    // We only ever process first value if any.
-    // @todo Field instance should provide always default value http://drupal.org/node/1919834
-    $commenting_status = isset($items[0]['status']) ? $items[0]['status'] : COMMENT_OPEN;
+
+    $commenting_status = _comment_get_default_status($items);
     if ($commenting_status != COMMENT_HIDDEN && empty($entity->in_preview)) {
       $comment_settings = $this->instance['settings']['comment'];
 
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/field/widget/CommentWidget.php b/core/modules/comment/lib/Drupal/comment/Plugin/field/widget/CommentWidget.php
index 26d3667..a320e58 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/field/widget/CommentWidget.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/field/widget/CommentWidget.php
@@ -36,8 +36,7 @@ public function formElement(array $items, $delta, array $element, $langcode, arr
       '#type' => 'radios',
       '#title' => t('Comments'),
       '#title_display' => 'invisible',
-      // @todo Field instance should provide always default value http://drupal.org/node/1919834
-      '#default_value' => isset($items[0]['status']) ? $items[0]['status'] : COMMENT_OPEN,
+      '#default_value' => _comment_get_default_status($items),
       '#options' => array(
         COMMENT_OPEN => t('Open'),
         COMMENT_CLOSED => t('Closed'),
@@ -65,6 +64,8 @@ public function formElement(array $items, $delta, array $element, $langcode, arr
     if (isset($form['advanced'])) {
       $element += array(
         '#type' => 'details',
+        // Collapse details when value is the same as default for instance.
+        '#collapsed' => (_comment_get_default_status($items) == _comment_get_default_status($this->instance['default_value'])),
         '#group' => 'advanced',
         '#attributes' => array(
           'class' => array('comment-' . drupal_html_class($element['#entity_type']) . '-settings-form'),