Well, they really need to nail the post launch fixes and still balance on content updates. I like this game a lot but the mission type is pretty limited at the moment. Also because of how they balance the game and weapon stratagem, even high difficulty level it is possible to solo the game. With the exception of 2 player required vault door. No other part of the game actually requires a full squad. The only thing that increase the likelihood that high difficulty needs more teammates and communication is the double cool down of stratagem and maybe future modifier that limits how much damage a solo player can dish out. And there is no real penalty if you missed the shuttle, as long as mission objectives are done, you at most lost a couple samples and some irrelevant XP and in game currency.