Goku Black's ending should have been Goku and Bejita aknowledging they brutally lost and had an entire timeline erased while Trunks ends up sad but conformed by the fact that the timeline where Gohan gets to live a normal life and start a family is still intact
The fact that it ends like it's all fine and dandy like in every other arc's ending was a massive biggest mistake for the story that was told, it's like Toriyama just didn't understand what he was writing