1. An End to the hardware Nightmares of Linux. Linux generally is not at the mercy of Windows Drivers. Linux Drivers for Android Devices has translated well to Linux Drivers on x86 for Desktop Linux.
Huh? I don't know of a single case where Android Linux driver development has made a driver available for the desktop. Mobile device drivers are very different from their desktop counterparts.
2. Root on our devices. Our Devices are our devices. I don't care how much I paid for the Device. If I was sold a device retail and paid for it in full, its mine. I don't care if they were sold on Amazon. We all should be entitled to have root, and unlocked bootloaders on our devices we pay for.
Linux hasn't, doesn't and will never help with this. Well, except in one way: Linux is buggy enough that it has, in the past, generally been possible to find kernel vulnerabilities to enable rooting on locked-down devices. That's a really backhanded "feature", though, since if the user can exploit the vulnerability so can an attacker. You're lauding insecurity, basically.
Don't get me wrong, I'm not anti-Linux. I switched to Debian as my platform of choice in 2000, and have never regretted it. I'm an Android engineer and enjoy the fact that the underlying kernel is one that's so familiar and comfortable. OTOH, I'm a security engineer and the size and monolithic nature of Linux makes it very hard to secure.
The manufacturer can void the warranty, but thats all. So what happens when root isn't a thing because of FushciaOS?
It's becoming not a thing for Linux, too, as we make progress toward closing the vulnerabilities in Linux. Actually, to the extent that Google manages to retain greater control of devices with FuschiaOS, you're more likely to be able to take control of your device. Google has always made its Android devices (Nexus/Pixel) unlockable, and has managed to require all ChromeOS device makers to allow theirs to be unlocked as well.