The amount of covers needed has been a growing problem, especially for new players. Proposed solution is pause new 4* releases for the next year. Instead revamp the worst 4s. (D3 should have the stats, and the firums are pretty clear who sucks!!!) Release them with new cover art and super sized powers. The new players can catch up and the seasoned players can have fun with updated anti nerfed 4s. D3 can even have competitions to get players to help revamp. Should get the 5* players into it as well.
Generally speaking, there are three tiers of characters: top, middle and bottom. The thing about buffing many low tier characters is that other characters will shift from mid to low or from top to mid tier. It’s a never ending cycle.
Most importantly, new characters have been proven to be a driving force behind sales. Asking them to stop 4* production is like asking any company to stop making money.