> extremely bad integration with tools like Yocto.

Is that really a feature? Having to use a mess of vendor kernels and overlays that patch anything from ffmpeg to GTK to chromium just to build a 5 year old, EOL kernel version that still doesn't do what the board was advertised as supporting.

E.g does a SBC really support accelerated video decoding if it's only via patched libraries that are also 3 years old?

IMO the embedded Linux ecosystem seems to really hate Linux since it rarely follows standards (especially in user space) or upstream drivers, etc.