In the case of a keyboard focused UI (such as the zulip example) I would agree with this post. But with a mouse UI my actions tend to always rely on my eyes feedback.

I don't think that I have ever been bitten by a mouse UI modification (excluding the case of a webpage making an async call that adds a bouton in the middle of a menu...)

Note to the author: you seem to like minimalist webdesign. However, long lines are not pleasant to read. http://bettermotherfuckingwebsite.com/ is a good inspiration.