Not all animation is bad. Most animation is bad. My comment is a guideline to help people figure out when something actually needs animation. If you're adding a

Not all animation is bad. Most animation is bad. My comment is a guideline to help people figure out when something actually needs animation. If you're adding animation because you think it's "delightful", it probably is making the UI unbearable for some users. Examples: animations that simulate real physical motion or cause flashes to appear on the page (like Material Design) on sites where users are supposed to read text are nearly always a bad idea from an accessibility perspective. Subtle animation that makes a certain part of a user interface clearer when the user is not reading content is okay if a lot of moderation is used. Don't think "how can I add animation?" -- think "how can I remove animation so that this still works?" Designers should also test the interface and make sure that it still works with animation disabled.