An IDE's literal whole selling point is supposedly being a packaged product that you can just pick up and run with, at the price of not being particularly good at any of the things it does (and usually being pretty expensive).
If you still need to customize everything then, well, what did you actually gain over assembling your environment by yourself from actually competent pieces?
I don’t think so, because the IDE doesn’t carry the language tooling with it, but interfaces with the tooling you already have in place.
That said, every IDE is opinionated about workflows, and if you’re open to adapt to that, the defaults makes sense. Otherwise you slowly hammer it to the shape you want.
For me an IDEs greatest selling point or the infinite flexibility it provides.
If you still need to customize everything then, well, what did you actually gain over assembling your environment by yourself from actually competent pieces?