>>101283328Yes the entire show was bittersweet with Jack always giving up on going to the past in favor of helping someone in the future.
The romance plot fits, thematically. But logically it's fucked up; he could have gone back in time all those times and nothing would have been different, except he wouldn't have met Ashi.
It SHOULD have ended with Jack fighting the guardian again and then finding out he CAN'T go back to the past because even if he does he can't change anything, so instead he works for a better world post-Aku.