Hyper-rolling and Elo
I noticed that 3* level 1-2 units regain their power, can beat OP comp (inclusive summoner) and this is good.
But to succeed 3* units you need luck (less then 25% chance) with hyper-rolling unless they normally come (very low chance). If you don't have that luck you will be a little behind with interest after that hyper-rolling leading to less chance to win.
Till gold division Elo rating system makes you to win more LP for a win than a lose. Above gold 1 division Elo makes you to lose more LP for a lose than a win. So hyper-rolling become too risky in high divisions. Maybe that's why I saw so few 3* units in platinum and diamond "set 1".
So IMO if you want more fun don't climb so fast :)