The truth is we dont know what we doing wrong or right. There is so many factor in this game where we can blame morale condition formation tactic bonus training so on and so on. Each have their own perception or believe what work and what not.
For me is quality 9* team will have 99% winning against 7* and below with right formation( not tanking). 1% troll which can happen once in a while. You can put aside morale condition bonus and not watching or watching which is all cosmetic.
So quality is the main factor in calculating the result and have all the advantage.

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