WSL... filesystem? Either way, I firmly disagree, there are not many cases where I've been unable to do dev work on WSL. Only when I need particularly weird / specific networking or hardware (ie. GPU, which might work now) have I had significant problems.
File IO from windows into the wsl disk and vice-versa is significantly slower so it's not great to, for example, use wsl git on a project living under your windows user directory or visual studio on a directory under your wsl home.
I think they're just using FUSE to make it work but don't quote me on that part.
Last I heard, using native git on Windows was slow anyways? Something about how NT handles files. So even with git it was already best to keep things inside WSL and just use ex. VS Code with a remote in WSL, and at that point it doesn't matter if you use radicle in WSL instead of git.