[baq]

Yes, the driver interface may or may not change, nobody knows where and when. That's a feature of the Linux versioning scheme and driver HAL policy. You can roll your own userspace-Linux-compatible kernel and it's going to be a toy until you develop drivers for it, which won't ever happen.

> Also, WSL1 and some BSDs are examples of Linux compatibility.

Yes, and they suffer from either performance or lack of drivers, hence WSL2 running a real Linux with some dark magic to share hardware and network, sort of. Surely you don't mean this as an argument in favor of rolling your own Linux-compatible kernel?