On a similar note, I also think the gem summon needs some changes. A guaranteed 4* hero could still give you fodder. Instead of a guaranteed 4*, they should give out 5* potential heroes. In that case, the worst you could have for every pull is like a 3* Izumi. Later on, she'll be useful when she gets her insignia equivalent. For the past 5 draws I've done, I have gotten all fodders that it makes me want to scream. I've paid some on this game but I stopped for the past month because I don't feel like buying anymore for this game(This is one of the games that actually made me buy something).
But they introduced the Valianite system, where if you get none of the 5* potentials, you get 3 Valianite; and still get 2 Valianite if you get 1 or more 5* potentials.