Earlier quoted context omitted.
They do so by using different teams, and their open source variants always lag behind what their closed source drivers are capable of doing across Windows, Apple and game consoles.
The drivers are decent enough nonetheless. I think having an open driver done by a different team and maybe a bit less optimized is still preferable to not having an official open driver at all.
So no that isn't decent enough, and I only keep it like this, because it is just a little travel laptop that I keep on using until it eventually dies.