As a very heavy user of IDEA, DataGrip and PyCharm, I still appreciate the level of power and flexibility JetBrains offer but continue to be dismayed by the absolutely massive binaries of their IDEs and really bad performance, especially their file watching capabilities which take ages to sync the changes done by external tools into the IDE.
Say what you may, VSCode feels lightweight in comparison despite a lot of plugins (I’m not a VSCode user but I do endure it at work).
Shedding IDE size, decoupling bundled plugins from shipped binaries, and improving file system sync would be great improvements they could do, besides pursuing AI and whatnot.