Why? What advantage does it bring?

Base UI is more low-level, a lot less opinionated and doesn’t force you into certain layouts. This of course makes it more complex to use, but that doesn’t matter if you’re using shadcn components because they’re doing that work for you.

So essentially they look and operate the same as Radix components at the shadcn level but you have low-level control later on should you need it.

Yeah instead of this slop a simple table explaining the tradeoff would have been far superior.