That is literally Classic Minesweeper, there will be 50/50s. I guess you could argue the map s on episode 2 makes some almost guaranteed 50/50s but still.
Yeah, I have no issues with 50/50's because of the Sonar, but in Master Mode I would prefer for them to be removed (or atleast there being an option of doing so), so that beating Expert wouldn't turn into a millions to one chance of beating it.