NTFS is by far the worse filesystem commonly used nowadays. Even Apple has a better filesystem.
When using Windows the thing I miss the most is instant copies. Everyone else has them and they are incredibly handy.
In fact, with a CoW filesystem Microsoft could even circle around the disaster that is Windows update without needing to remake their entire OS.
I’m personally waiting for utf-64 and for unicode to go back to fixed encoding and forgetting about merging code points into complex characters. Just keep a zeptillion code points for absolutely everything.