

Sort of. Whatever hardware these are intended to run on require something like 3X the driver code (at least in the case of the Android Linux kernel, according to Greg Kroah-Hartman). Phones tend to have more specialized and proprietary hardware, so you can’t just take the standard Linux kernel, use it there, and call it a day.
But I’d be surprised if the people working on this weren’t aware of that fact, and I hope they are working on abstracting the hardware layers more so that every mobile Linux project doesn’t have to start from scratch every time.
Edit: source (YouTube, sorry) for the claim about how much driver code is required for mobile devices.
I fully agree with you on the accessibility front. It’s not even good on X11, but it’s unusable on Wayland, from what I understand :( Accessibility on Linux needs a massive funding and development initiative, and it needed to be done a long time ago.
But uutils is pretty solid. I’ve swapped out my GNU coreutils entirely (on Arch, not Ubuntu, because I value my time too much to be troubleshooting broken snaps) and haven’t run into any issues. I think people are underestimating how close the compatibility already is. I’m sure something I use at some point will try to invoke an option that doesn’t exist in the uutils version, but it’s been solid for me so far.