That's not what the document says. Let me quote > Unfortunately, WSL1 was hampered by the performance characteristics of NTFS, which do not match the expectati

That's not what the document says. Let me quote > Unfortunately, WSL1 was hampered by the performance characteristics of NTFS, which do not match the expectations of Linux software. This is true but whether this was the cause or one of the causes to abandon WSL is impossible to know unless Microsoft tells us. Back in the day they said they are working on NTFS improvements but it needs assistance from the Windows side. Who knows.