Google does a good job with the lead (Nexus) devices, but the support elsewhere leaves a lot to be desired. Unfortunately the lead devices do not cover enough options (I'd _love_ to be able to buy a 10" tablet with a pixel qi screen that was fully open, but no such beast exists, and as far as I know, there isn't a 10" Nexus option at all)
some of this is the device manufacturers opting to not be open, a lot of it is the underlying chipset vendors opting to not be open (video chipset folks are especially bad here)