For me, this hasn't been an issue. I think number one is just that I don't have to do this often. Perhaps sometimes I download a file with my Windows browser and save it locally, and then want to get to it in WSL2. Maybe I'll copy it somewhere locally, or since it's just a one-off, grab it. And performance doesn't seem like a problem. All drives are NVMe SSD. Perhaps if you have use cases where you're managing/editing a lot of files between file systems, it could add up to some frustration.