But career mode will be more like running a real space program, rockets and parts cost money, you get money for a completing task, and you'll get punish for a failure. And Mods add so much more to the game. Sandbox there's no goals.
I paid for the game with my own money, And I shouldn't be allowed to play with mods? Its a single-player game, why should you care about how I play the game? Plus stock gets pretty old really fast.