I'm torn on the 3*s in premium Gacha

When starting they're OK and giving players too many 4*'s early would be a little too much...

I would say something like when you hit level 50 they go away but then you'd never be sensible spending gems before 50

A super premium spin maybe at 7 gems would seem a nice middle ground....maybe no 10+1 to really make the 50 spin a gamble at 4.5 gems a spin, and the premium your 'safe' bet when starting to get a few 4's, then when they're meaningless do you keep spinning for the 4*'s and likely skill up or equip up fodder....or gamble for 5's and 6's

Save scumming for 'good' results takes some of the fun away, and if it leads to penalising me for those odd times my net decides not to play ball that's not great.