That's it then. If you run Windows in VM on a "retina" Mac where each
original pixel consists of 4 smaller pixels then 100% is just unusable because everything is too small. I can imagine 4k screen with 100% is usable on a 27' monitor but it isn't on a 15' monitor.
Correction, MBP has a 5k screen (2880x1800) so it's even worse.
Jiri