Given that the document has a section on WSL1 as prior art, they're clearly aware of the problem. It seems that they're mostly assigning the problem to NTFS not having the performance characteristics expected by Linux programs written against ext4, which seems like a solveable problem when working on a green field and can design the filesystem accordingly. Microsoft did not have that luxury.
Do you think they're misdiagnosing the actual problem that WSL1 had?
Do you think they're misdiagnosing the actual problem that WSL1 had?