Their absence became especially apparent when I found that instead of being able to "peek" around a corner to see what's there before moving I had to consume one of my two moves to step around the corner, at which point I could either fire or step back but not both...and had I done either I would have sacrificed my chance for overwatch. Or take the example of how moving two steps eats up an entire move, just the same as if I'd moved as far as I could for that single move action.
It's definitely a "modernized" (i.e. simplified) tactical, turn-based game. I just wish they hadn't simplified the combat system so much. I guess I'll have to give it a final verdict when I play the finished game but for now I'm just not sure.