Oh, they are empty, randomly generated worlds.
So what's the point? Gather space scrap and space epoxy?
People are thinking about this the wrong way. In every open world game, the majority of the world is filler. You're not supposed to play Elder Scrolls or Fallout by aimlessly waltzing around the overworld, you're supposed to visit towns, do quests, and get distracted by dungeons and enemy encampments. The open world is just organizing everything in a comprehensible way that feels more real as well as giving the player the freedom to bounce around between objectives in whatever order they choose.
The
starfield of planets is analogous to the overworld map of any open world game. You're not supposed to spend dozens of hours exploring each planet anymore than you're intended to spend dozens of hours in one dungeon (even though several games like Castlevania do that). The "point" is a quest will send you to an objective on some far flung desolate planet, you scout it out for their base, and then do a dungeon run, then return to the quest giver just like you would in any Bethesda game. And if you need to repair your ship or work towards an upgrade, you can gather space epoxy.
It's not like they can just make a handful of cool Star Wars planets. If they want the player to engage with their space ship systems, there needs to be a reason the player is using their spaceship so much.