[coldtea]

Not exactly, as the functionality is experimental and subject to change. That was the whole point of the prefixes.

Syntax and behavior of css changed between proposals and early drafts of a new feature and the final result.

So without prefixes you'd have a single "XXX" CSS name that might get deprecated altogether (eg the name ends up XXY) or be defined to have different behavior (e.g. it remains XXX, but not it also makes the element bold rather than just italic).