Ashi & Jack's relationship was pretty forced over the course of like 4 episodes, so there wasn't enough time to develop any emotional investment. Overall their relationship does kinda make some sense considering they're both people who don't have any experience interacting affectionately.
I was really hoping that more focus was toward's Jack reuniting with his family. That was one of the biggest motivating factors for Jack throughout the entire series, so him coming home to his father and mother should have been THE moment where his journey had finally come to an end.
Decent ending, but wasted potential for me