WSL's origins are actually as a android subsystem for when they where making a mobile play with the Windows Phone. At the time it ultimately got scraped because it was too ambitious of an undertaking, and got spun off as WSL. Now that android[0], windows OS and WSL[1] are more mature it's going full circle.
[0] maintaining an android subsystem (and various versions as distros) should be easier now for the same reason it's easier for vendors to update phones, project treble.
[1] better filesystem sharing, GPU pass through, WSL is close to natively supporting graphical applications, etc
[0] maintaining an android subsystem (and various versions as distros) should be easier now for the same reason it's easier for vendors to update phones, project treble.
[1] better filesystem sharing, GPU pass through, WSL is close to natively supporting graphical applications, etc