Editing existing menu item on edit node is VERY confusing

Trying to edit a node with EXISTING menu item
NOTE: if you are creating a new menu item the following description will seem OK

"menu link title" appears under "menu settings" (so far so good)

but upon pressing on "menu settings"
no information reveals that actually a menu item exists (confusion 1)
a checkbox only says "create a menu item" (confusion 2)
upon clicking on the checkbox
another checkbox underneath reads "delete this menu"
(which menu, it seems we have not created one since)
"menu link title" reads "undefined" (confusion 3)
meanwhile "parent item" is correctly set (confusion 4)

if we decide we don't want a new menu item after all
upon unchecking "create a menu item"
"menu link title" under "menu settings" reads "Not in menu" (confusion 5)

What would seem as a more sensible behaviour on menu item edit
1. "create a menu item" should read "update this menu item"
2. existing menu link title should be in the menu edit form
3. upon unchecking "update this menu item" existing "menu link title" should reappear under "menu settings"