the fact that one needs to know stuff like this and that it changes every three months seriously limits the usefulness of LLMs for me

Being in the cutting edge isn't for everyone. If you can find an island where staying updated is optional you can choose that. Imo, these islands are fast shrinking.

I get this. On the one hand, those things I wrote down are just simple conclusions from immediate experience, not something I had to learn or feel burdened by - but on the other hand, when I look at similar lists for e.g. how to effectively use Claude Code, I recoil in horror.

There's a silver lining in this, though: none of that is any kind of deep expertise, so there's no need for up-front investment. Just start using a tool and pay attention, and you'll pick up on those things in no time.