Rebalancing doesn't automatically mean they're making 5-star victories less possible. There are definitely some under-utilized troops that need changes if they're going to make it into the meta. As for matchmaking, from what I understand, there's not going to be a quick or easy solution. It'll be a long, evolving process if you expect to have a computer find a equitable matchup between two completely dissimilar groups of players who are eaching trying to gain an advantage. Personally, I think I'd prefer to have warring be more like a boxing match. Just pair up bases by ages and if one side flattens the other, tough cookies.