> they'd mandate UEFI+ARM like Microsoft did with their phones (except without the locked bootloader)

I approve, but is that sufficient? UEFI gives you a better booting situation, but I thought you still needed device tree or something to handle device enumeration? Or does UEFI do that?

EDIT: In an attempt to answer my own question, I dug up https://elinux.org/Device_Tree_What_It_Is#UEFI which implies that UEFI can replace device tree and give you an actual uniform platform. If I'm getting that right, then that does look like the best possible solution.