Well, when you're pooing or having breakfast the other thing you could do is reading newspapers. Really 20 minutes per day clicking on a blue button are so unaffordable?
Anyway no one need to spend time on a phone game if he thinks that is a waste of time. But you can't complain that is impossible to build competitive teams.
You build 5/6* teams and you're happy with it. I build 7/8* teams and I'm happy with it.
There are people that manages 3/4 accounts and they're happy with it.
I've never spent a cent on this game or other games and never will, others spend some moneys, others spend a lot of money. Everyone manage his time and money as he prefer... That's all.