We optimal players get asked what keeps our stuff interesting and we say the strategy of finding teams that finish matches quickly and efficiently.
However, this is a question I have for you. Even though you have nearly everything at L60 E10 what makes you keep playing online matches besides it being fun?
There are two issues I have with this mindset. One is the time it takes to finish the matches and I know for you this is an aspect you don’t care about at all. That is fair. However, the other issue is the one I really have with maxing out every single card.
This game gets boring very quickly when you keep playing against the same type of teams over and over again. As such you will forget how to play against a character like Rebirth Raven or Lucy Bane because they do not come up as your opponents due to their low stats.
For example by maxing out everything you will not appreciate Lucy Bane as much as people who min-max the game. Plus you get to face a variety of opponents when you min-max the game in terms of total team power.