Kind of odd, but if you approach it from the perspective that it’s a “championship” and everything leading up to it was “qualification”, then it kind of makes sense. Would be better to give order choice to the higher seed, as sometimes it is advantageous to play as P1.
btw, I analyzed some head-to-head data recently, and basically found no hard evidence of a P2 advantage. That said, the advantage is situational so in aggregate you may not see it.