Man pages rarely are enough in my experience. When I encounter an issue with grub-install not writing to my EFI system partition, good luck finding much about it in its very short man page. You’ll have better luck using the ArchWiki, which is like a much better man page, but a simple Google search (or another search engine) will show a forum post with an easy solution as the very first result.
Piping six man pages through grep to find what I’m looking for is simply not as fast as Googling an error message.
I think there’s also a sort of cultural difference between languages and tools frequented by newer and older programmers: more experienced people look for documentation and then get working on their project, whereas less experienced programmers look for tutorials and very specific “soft” documentation.
Transitioning from modifying tutorials (the type-in-the-code-in-the-magazine of the 21st century) to glancing at the documentation is probably the surest sign of maturity. Still, you can get a ton done by copypasta.
This might have to do with learning to code with or without the Internet, I’m not sure. I’m personally very envious of people who can take a look at the docs and just get chopping without the assistance of the GIF-covered Medium posts.