Chromium-vaapi probably works well enough for most users but that doesn't mean it's officially supported, there's a reason it's a separate package instead of in the mainline build (i.e. it's been up to merge multiple times and declined each). Even then >60 FPS display and HDR do not function on Linux (though that doesn't affect as many as the decoding/GPU acceleration issues).

It is definitely better than Firefox on Linux but that doesn't make it well supported.