Yeah, that's a straw-man. I've worked on large-scale projects with many team members, and it's perfectly possible to use CSS as it was designed.

But sure, like most tools, it starts with understanding how it works.

Sure it's possible, but is it possible for everyone on your team? Including the new hire, the interns, or the now-vibecoding managers?

Sooner or later it deteriorates.

Sure, but "total ignorance of how CSS is made to work" is also a straw man.