I agree with everything you said, but I don't see how it's relevant to my comment, unless you misread me?

UI in general is regressed continually - completely agree with you there, yes.

The article however is specifically about Jetbrains. Jetbrains may be regressing their UI. Perhaps someone should spend some time looking at Jetbrains' new UIs and analyse whether it does in fact constitute yet another example of regressed UI.

This article doesn't do that - it makes a very lazy & exceptionally poor case.