I keep wondering the opposite, Coin flip is luck based anyway you look at it... you may very well have a game where you only get tails, this has to happen just one time (Perhaps at an important tourney) and you're out. I know the facts and you probably heard them as well, you get more cards out of birch overall, good timing though is never guaranteed.
I have tried Birch, else I wouldn't say all this. But I think there's enough reason not to use him. Of course It's also a matter of play style. I like consistency above pretty much everything. I never use cards that rely on coin flip.
People play it because statistically you have more gain than loss. When compared to Shuana's 5: Tails, you lose one card. Heads, you gain 2 cards. 4 cards isn't really horrible either, especially with Shaymin EX (which has a number of ways to be retrieved from the deck).
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