It sounds like you just want Intellij Ultimate. Fleet is explicitly aiming to be VS Code like while Ultimate is just regular Intellij with access to most language plug-ins.
It was disappointing to see, as I am really tired of running multiple IDEs to work on mixed language projects.
mixed language projects are the __norm__, not the exception. I get most often bitten by this when I have both C++ and Python IntelliJ projects configured in one tree, and it starts complaining about project name clashes.
complete waste of time, and i wish they would fix outstanding bugs, especially small cosmetic ones in the existing products, which have the lowest risk of regressions. case in point https://youtrack.jetbrains.com/issue/DBE-11296 ... which after three years elicted the response "We have no plans to implement this feature in the near future."
Is there anything IntelliJ Ultimate is missing in your opinion? I use it with quite a few different languages (JS, TS, Java, Kotlin, Dart, Go, Rust, Erlang, C) and it works really well (except maybe the last two but I very rarely need them).
I tried it out 3 or 4 months ago, and I didn’t find it useful, nor familiar - kind of feels like a VSCode wannabe.
It was disappointing to see, as I am really tired of running multiple IDEs to work on mixed language projects.