I think that what it is really missing is a way to merge all the features we currently have. Like differentiating the slot capacity in the suit/ships/exocraft or their number/type based on the ship type (figheter more tech slots of a hauler which have a lot more cargo slots)
Oh yes, also a way to use all the money and resources we accumulate (too easily) and an overhaul of the planet generation, or at least a massive addition of models to increment the variety.