It's the default state that happens with Linux ports. Unless there's an existing de facto standard OS whose boot interface can be piggybacked on. But the boot

It's the default state that happens with Linux ports. Unless there's an existing de facto standard OS whose boot interface can be piggybacked on. But the booting is just a small part of the mess. For the rest I guess the answer is similar - the default state of things is "not working" and a lot of things have to go right to make things run well. (How long did it take for RPi to get working hw video decoding OOTB with a distribution other than the board specific one from the SBC provider? Or does it even now?)