because tailwind is not "classless"

This.

It's just a bunch of code examples and text, so no fancy layout or styling is needed.

I just want a modern look, without much hassle.

somehow tailwind sits in between, maybe it's nameless ?

Does it?

I had the impression, if Tailwind has one thing, it's a multitude of classes.

From the few I know, the classes are mostly shortcuts to css features (container are one of the exception), which are of course defined as custom classes but they don't create a new layer of (name,meaning) unlike what I assume we were all doing.