Because of this line, subthemes can't add their own CSS:

  $variables['styles'] = drupal_get_css(clean_css_stripped());

This means that attempted to do drupal_add_css() in a subtheme produces a WTF, and the fix is to redo that line from clean's template.php, which is wasteful.

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psynaptic’s picture

psynaptic CreditAttribution: psynaptic commented
Status: Active » Needs work

This has changed in Drupal 7, it doesn't require the CSS to be rebuild any more. If you'd like to change this then I encourage you to do so. This technique is used in Tao by devseed, maybe they have fixed it there?