I really, really wanted to like and use their IDEs (esp their Ruby 'intellisense' or w/e), but the lack of popular theme support kind of killed it for me. I wanted my IDE to look like my VSCode editor, but, at least a few years ago, that wasn't really possible since iirc there were only a handful of theme options.
Arguably the 2nd biggest: the biggest was when they made that shit mandatory, in that I can no longer go into Settings and uncheck "New UI". The breadcrumb placement[1] alone almost made me rage revert to 2023.something since it was so instrumental to my workflow. Maybe by next Oct I'll have retrained my brain to look in the new location, but goddamn was it that important to them?
1: yes, I am aware of the Setting that says "breadcrumb placement = top" and I am also aware it does absolutely nothing. I'm currently too burned out on their process to open a YouTrack about it
You can theme it yourself without too much hassle. I like my dark mode to be black rather than grey, and just made it do that, and it just works. It took an hour or three to understand the process because I'm not a Java person and am not familiar with any of the tooling, but then it was super easy.
This was a few ago, so they may have improved that part by now, I've just carried my theme over the updates.
