Chart.js

Raised as a usability problem by 4 people on Hacker News over 4 years (2013–2016), in 3 threads.

People raised many different problems with Chart.js, 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 4 complaints

Hard to customize graphs beyond the default options2016-04-25
Took ages to find the license; had to search the documentation for it2014-06-30
Scrolling over the nav scrolls the page, so bottom nav options are hard to reach2013-03-20
Animated graphs in the corner distract from reading the main graph2013-03-19