Animation wise and specially background wise its miles better than eternal, camera movements are way mora dynamic and less static than Eternal.
With regards to the Chibi-usa scene, its just a montage she is saying that she is leaving to the 30th century to all her acquittances, the director explained in an interview that he tried to give more screen time to some characters, so this is a good way of doing so, its not confusing not was oprrety clear what was happening.