I think that we should be able to sell 5 star champions for 5 star shards, so if you get a trash 5 star you can sell it for 5,000 shards, so you can try to get a new, and better 5 star.
I think that we should be able to upgrade champions, for example make a 4* into a 5*. This can be done by using shards on a maxed out champion to upgrade it to a higher star champion, keeping the previous power rating. Doing so would incentivise players to stick with a champion they like and would make champions more…