That was definitely true many years ago. Nowadays Haskell has some really good tooling.
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.
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.