Once I got at least one of every variety of ship in a B-class or higher, there didn't feel like much else to aim for. I'd send guys off on freighter stuff to do quests, and then just kill time until they got back, sell their loot, do some ship upgrades, rinse, and repeat.
Everything the game does is serviceable, but nothing that really makes me say "I've gotta pick this up again!" The space combat was not up to the level, of, say, Freelancer, nor were the scavenging missions terribly enjoyable. I never really got into the multiplayer/co-op aspect, other than encountering other players running around the hub area.
Don't get me wrong, I enjoyed my time with the game. I just don't feel the need to go back and play it some more, even with all the (admirable) content they keep putting into it.
If I wanna keep sinking dozens of hours into a game that seemingly goes on forever, I'm only 90 hours into Tears of the Kingdom.