Aquamacs

Raised as a usability problem by 10 people on Hacker News over 6 years (2008–2013), in 8 threads.

People raised many different problems with Aquamacs, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 10 complaints

Arrow keys extend the selection instead of collapsing it, unlike other GUI apps2013-05-20
Behavior was odd and didn't match the documentation2011-10-21
Commenter had no idea how to use it and gave up2011-10-02
Aquamacs is different enough from Emacs to be maddening to use2010-12-03
Holding down C-n in Lisp files makes editing noticeably laggy2010-05-10
Feels much slower to interact with than vanilla Emacs2010-05-10
Overrides user's .emacs customizations, forcing it to fight the user2009-10-26
Can't figure out how to bind function keys2009-02-05
Saves settings into custom-set-variables and custom-set-faces, clashing with the user's hand-built .emacs file2009-02-04
Option-as-Meta breaks Mac keys like option-U, and closing Preferences leaves an empty window2008-06-20