It depends on the language but agreed. If I didn't have internet or AI access, I'd still be able to pull out manpages or dig into source code.

I wouldn't like it and it'd be slower, but I still understand my environment in sufficient depth to work without external info if I absolutely have to. Even with AI, once in a while I ask it to just give me some hints instead of solving something for me, so I'm forced to do the work.