The game is pointless to return to. Base building has not point. There is no reason why anyone should even build a base. And the ship builder is cool, but it’s like a Lego, you can’t fly it.
This IP isn’t going to last a long time without that stuff.
To spoil it for anybody, Starfield has a "new game plus" where you carry over your character, stats, and inventory to a new universe (the new universe has new things).
But here's the kicker:
That base and ship you spent all that time building? DISAPPEARS.
And the game encourages you to do NGs so there seriously is no reason to build.