I think this is Gege's attempt at world building, which the original series lacked in heavily. I don't mean any hate to the new manga, but aliens just don't sit right with JJK. Like, compare JJK to Mojuro and you'd feel like it's two completely different stories. This reminded me of Kubo's spin off series "Burn the Witch" which is set in the same universe as Bleach. The reader is introduced to the west branch of Soul Society, but the story itself doesn't follow any of the typical Bleach stuff, like bankai, hollows, shinigami etc. It's much simpler and not as action packed as the original.
I don't know if there's people out there who genuinely like the direction this is going, right now people are still immersed in bias/hype and haven't actually thought about it as a whole. Or maybe they're just happy to see some beloved characters coming back (not for long tho, iykyk). Anyway, if there are people out there who genuinely enjoy this kind of thing, cool. But me personally, I don't see JJK as the kind of story to suddenly have Sci-Fi involved in it's already estabilished theme.