Not exactly. Microsoft is trying to expand functionality in certain places to allow things like CUDA acceleration, AF_PACKET support, and other important hardw

Not exactly. Microsoft is trying to expand functionality in certain places to allow things like CUDA acceleration, AF_PACKET support, and other important hardware-y things that WSL can't handle. You're right that you can run a different kernel, but Microsoft has modified theirs for WSL. For that reason, they have to release modifications.