I think the problem people had with The Pits was more related to the design of the event than Mega Coin.
Let’s pretend Mega Coin doesn’t exist. All the teams are still neck and neck the whole round and then it would be whoever drops the most super attacks at the end wins.
There is too heavy of an incentive for everyone to hit the top team. This makes it a game of staying in the middle of the pack (so you aren’t a target), then hopefully you have more goodies to use than the other teams at the end.