It would effect pvp so much because as he said different sets use different ev spreads so if you are vs a poke with less hp then you know it has to be less defensive and more offensive so it will probably have speed spatk/atk and that just takes the predicting aspect out of play because in ranked most sets people use are the same so knowing someones set before they even make a move kinda ruins the whole point of that person puting in work making a strategy