There just isn’t a C#/.NET plugin for IDEA that replicates the Rider functionality, though. Same with CLion and AppCode. They do ship Ruby and Python and PHP plugins. The JavaScript/web dev stuff is baked into all of their IDEs.
Re:Reflections on IDEA vs VS Code
by headmelted on Sunday March 07, 2021 @03:19AM
(#26374204)
Which means IDEA does not contain all the features of the individual IDEs.
The thing is, I’m confident in saying the plugins don’t replicate 100% of the feature set of PhpStorm or WebStorm either, but I’d defer to someone from JetBrains who has first hand experience.
If you're confident, what features don't they have?
I subscribe to all their products so I can verify this :) I'm not sure why they don't have C# or C plugins but my guess is that it's because there's enough extra work in those IDEs that they want more money for them. Rider contains the ReSharper backend, which is a completely different application from IntelliJ.
The IDE shell is the same, but in (for example) Rider there are features that are in Rider but not in IDEA.
Likewise RubyMine. I suspect WebStorm and PhpStorm, too.