Definitely!

Not only for the user, but it makes sense for the process of making the tools as well.

If I left the agent for itself, it often come up with outrageous styles and I need to prompt it for something more sober.

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You can do a lot with just CSS. I restored this 2009 project of mine just now:

https://alganet.github.io/ghiaweb/

It still works (minor misalignments though), all HTML is pure (no class=, no css=, no <div>). The global CSS does everything: the forms, the drop-down menus, etc.

Nowadays, we can do even better, no build step or anything like that.