Nonsensical paths to all of my disks, the terrible emulator that is cmd.exe, the poor support for spaces, the ambiguity between forward-slash and back-slash, th

Nonsensical paths to all of my disks, the terrible emulator that is cmd.exe, the poor support for spaces, the ambiguity between forward-slash and back-slash, the fact that here and there, this or that random feature I take for granted on POSIX will not and cannot ever work... That last one is especially frustrating because I'll spend three hours getting tool XYZ to compile on cygwin, and then just when the finish line is in sight I find "BTW /dev/null is unsupported in cygwin, and tool XYZ cannot run without it". I mean, /dev/null is supported, that's just an example- it's always something fundamental that you would never imagine doesn't work.