I want to give X3AP a go, but a game of X3 is a big undertaking and I don't want to have to start all over again after discovering that some seemingly inconsequent decision I made 50 hours ago means I can't get the PHQ or something. What determines if I get access to particular plots? Do some starts offer more plots than others? Are there mutually exclusive plots or branches?
Every start type in X3:AP has the plot enabled except for the custom start.
For non Terran starts, there are are 3 plots lines, the main missions, and the hub missions, and the PHQ. All are tied to reputation requirements:
For the Terran and Aldrin starts, there is only one mission: