But with the recent LSP decoupling of the IDE to the compiler, it is quite possible to make good tooling that is independent of any particular editor. It's just that the language's popularity is what induces contributors (as most are realistically after "fame" and "portfilio" when doing contributions).
It has a feature-rich LSP, code formatter, package manager, dead-code checker, configurable linter, thread debugger, memory debugger, vulnerabilities checker, and much more.
That’s just what is provided by external tooling. Then, it also has everything the compiler has to offer, which is bit more than what most languages do. For example, you can now compile to JavaScript or WASM.
No it isn’t. This is a stupid meme that people just dogmatically perpetuate.
Also, you can build pretty much everything in Haskell with a plain text editor and ghci. You get better code that way too!