Ubuntu on Windows

If I use Cygwin's package manager, I don't compile anything. It seems to have a fairly reasonable set of packages... at least for my limited tastes. I realize everything has been recompiled, but so what? So far as performance goes, I haven't really noticed a significant degradation... but then again, I haven't done much other than run some simple tools. Supposedly I/O is a lot slower... but then again, how is Ubuntu's userspace installed for Windows 10? In a directory tree on the host's filesystem? How many issues will that cause? Or are they using a disk image with native ext4 or something?

Again, Microsoft says it is for developers... and not really for users nor running server applications... and in that use case, they are probably similar. Except at this time, Cygwin's terminal emulation might be a tad better.