Lost you already. Since Fuchsia uses a pushover license instead of a copyleft license, the vendors' drivers aren't going to be open source. Look how many companies today don't open-source their Linux drivers, and they're breaking the law by not doing so. It's going to be so much worse when there's "nothing" wrong with keeping them proprietary.
This is great term for it, thank you.
So, when an open source driver exists, Fuschia will make it useful for a long time.
Further its entirely possible for a device to require signed drivers and their is even a security incentive to doing so. They don't have to ever let you have your own drivers for their hardware.
Hardware running software that is either proprietary or based on permissively licensed software is everywhere. It's usually impractical or impossible to run your own software on such devices. There is no particular reason to trust Google any more than any other big company. Corporate persons judged by the moral standards one would apply to people are nearly always bad people even wherein most of the people therein are OK to good. Trusting them beyond their own self interest is nearly always a mistake.
Therefore, your criticism is completely without merit, and should be ignored entirely.
1) Fuschia doesn't have a property. (It doesn't compel hardware vendors to provide open source drivers.)
2) No other operating system can possibly have that property either.
3) Therefore Fuschia should die, to help one of those other operating systems succeed.
Do you not see the flaw in this argument?
As an alternative I suggest you look at actual Linux devices even if they are objectively worse if they are more open.
Linux has not compelled Nvidia to produce good OpenGL drivers.
No, really, walk me through this.