Very few tools designed today have any features that facilitate learning. Developers don't understand how learning works and don't really care. Operating systems mostly washed their hands of this issue as well. It's a mess.

I agree. Jetbrains did well with their IDE I think, they show context aware suggestions often, but in a non-obtrusive way. This is effective because the information is there when you need it, not when you have no idea what to do with it.

True. There are just too many.

I should still improve my knowledge of git, gradle, intelij, various command line tools, docker and so on.

That by itself isn't to much but all this stuff comes on top of just staying up to date with the plattform you are working on and learning the next framework or library which you immediately need. Looking at you, android and your yearly updates, Kotlin, and a dozen jetpack libraries.

I get that, there's too much and changes too often. But there are cases where going a little deeper improves productivity a lot. Where I work we're assigned to projects that last at least a couple of years, so it pays off to spend some time learning the tools.