That'd be if you're crazy enough to not do any of the major quest chains or general side quests, those almost entirely take you to unique areas with their own exploration outside of the random exploration ones that you find just by exploring the galaxy.
I think it points to a larger issue with the game, which is being able to to distinguish and access the kinds of content that you want. You could easily randomly explore and end up seeing the same installation three times, or you could also randomly find other quests and go explore three unique locations and dungeons in a row instead. There is absolutely a large amount of unique content to play, though, it's disingenuous to say otherwise.