2 new features I think would be cool
The 1st is to have archive and daily challenges show up in the match details screen while a player is in game. This way you can track your challenges while in a physical game to see if you're getting any progress towards them.
The 2nd is to give us a way to trade in event offerings for BP or a BP offering like BPS. It would need to be a feature where we have the option to trade them in because I know there are people who like to collect offerings from events.
For people who don't care about collecting event offerings, give them a way to use the offering after the event so it is not sitting in inventory never to be used again.
(I guess this really would only apply to the Halloween event offering since that changes year after year. Lunar New Year is the same envelope so it can be saved and used again and the Anniversary is just a BP offering.)
These 2 features I think would be nice quality of life changes for the game.