It doesn't enable you to do anything that CSS didn't already do. It's just a different way of writing it. Knowing CSS is a prerequisite to being able to use Tailwind.
"Tailwind is for beginners" just sounds to me like "I don't like this thing because I'm too smart for it"
Tailwind does not require knowing CSS. It'll get you around tailwind faster if you do know it, but you do not have to care about what Tailwind is really up to when adding "outline outline-2 p-4 outline-offset-2". This is a major reason why people pick it up in the first place, to ignore CSS as much as possible.
Where are do you so frequently see that being suggested? I would never suggest that and I've never seen anyone say something like that before.
Tailwind is not an alternative to CSS, it's a way of writing CSS.
More like "I don't like this thing because I don't understand it, so I blame it on juniors because I feel superior to them, so I must be right"