while if you base a tournament on mirror matches except it will be a failure in esports measuring terms because significant portion of the fans wont watch it , it will require 1 match for the wehrmacht and one for the soviets and unless its played on a chessboard to ensure no map side favoring it will require 4 games istead of 3 , this is not shooting yourself in the foot its shooting yourself in the head with a bazooka or a panzerschreck to ensure you wont miss the hit . And even if you need 2 matches then you will need a third in case of a tie . And about the unfair conditions you discribe , i have watched a ton of tournaments , the fact that we have 4-6 players dominating them on a very consistent basis each year (sometimes they change because some of them stop ) proves that the ones who are the best end up in the top spots .
Your post makes no sense. Why would i need 2 or even 4 matches? If mirrors are available, each side can pick the faction they want without being forced to play a specific faction as it is the case without mirrors. Thus, we only need 1 match. Just like it is done for any other game with mirror maatches available.
The rest of your post is invalid as well, because like CombatMuffin pointed out, you're assuming people don't like to watch mirror matches. This is a subjective oppinion.