You say that, but I've seen a few too many people delete random system files because they didn't know what they were and needed space. Granted, they should've read the "keep out" signs and have only themselves to blame.
These files are hidden by default, so not only didn't they read the "keep out" signs, they tore them down and said "See? No sign." and then ran into the hole.
I guess at some point you can't protect people from themselves anymore. One might even argue that people who use WSL (especially in beta) would be tech-savvy enough to understand how it's implemented and works, but apparently not ...
Sure - it is not a good situation. To me it would have sounded perfectly reasonable to edit WSL files with a Windows editor. There could at least be some kind of __README_FIRST_BEFORE_DOING_ANYTHING_IN_THIS_DIRECTORY.TXT.
I just wanted to make clear that the parent comment is slightly hypberbolic.