You can definitely write to the windows file system from WSL, so long as you don't need admin privileges to do it. I use it at work and 99% of the files I edit are in a windows controlled drive.
I tried to adapt to this by instead of writing to the Windows file system from Linux; to instead write to the Linux file system from Windows. After corrupting my profile 3x and having to reinstall WSL each time, I went back to vagrant[1].
[1] vagrant is also really slow on Windows.