"I feel that the core IDE has degraded in quality over the past years because the releases were feature-driven, and I'd be happy to see IntelliJ refocus on quality instead of quantity."

I couldn't agree more. The latest versions have a ton of bugs that were not present before. Some of the IDEs are totally unusable for certain tasks like debugging. I don't think they will focus on fixing bugs and they haven't introduced any great features, IMO, in years.