True, but I think there are things google could do to alleviate many of the problems here. My understanding is that drivers appear to be a significant contributor to the portability problems of Android across devices. This is the same problem that Microsoft had for years and thankfully seems to be largely resolved with 7.
The fix is relatively simple, all "certified" devices must register their driver software with Google so it can be centralized, pooled, shared and reused without restriction.
Another problem is the bizarre proclivity of manufacturers to encrypt their boot loaders, then release a "fix" for it a month later. Just require manufacturers to not lock the bootloaders, that easy. Locked boot loader? No license. Done.
Note: Insterestingly, I believe it was HTC that accused Google of requiring the encrypted boot loaders to comply with the DRM'd distribution of media through Google's market.