We can dream of what it would be like with full POSIX support on Windows, but it was a pipe dream to begin with. There are some major differences between Window

We can dream of what it would be like with full POSIX support on Windows, but it was a pipe dream to begin with. There are some major differences between Windows and POSIX semantics for things like processes and files. The differences are severe enough that Windows and POSIX processes can’t coexist. The big issue with files is that on POSIX, you can conceptually think of a file as an inode, with zero or more paths pointing to it. On Windows, you conceptually think of a file as the path itself, and you can create mandatory locks. There are other differences. Maybe you could address these given enough time, but WSL’s solution is to basically isolate Windows and Linux, which makes a ton of sense.