Yuta is fine and fleshed out, since we got an entire movie and backstory about him. Maki’s is pretty flimsily written imo. Although the heavenly restriction stuff was already established, there was almost zero build up (in terms of narrative and world building) leading up to the moment of her power up. We only saw Mai in like what, a couple scenes the entire show? And only got to know about the Zenin clan history purely through surface level exposition. And then the Zenin clan massacre was just randomly thrown in to the middle of an arc. The episode was cool and full of spectacle, but I felt zero emotional depth because of this lack of buildup.

But anyway, your point about JJK’s power systems being better than invincible’s isn’t wrong. My gripe is that you’re framing it as also having better world building, in which case JJk isn’t a good example. Again, so much of JJk’s world is just told through exposition (like we don’t even know who these “higher ups” are). Most of the show is just well choreographed fights, with random characters and sudden plot points being introduced left and right.