The current rules for starting first/second make the game more unbalanced and less fun to play

During the first turn, you can't attach energy, but you can technically still attack. In the physical TCG, you can attach energy, but you can't attack (unless a card explicitly says otherwise). What this change ends up causing in practice is:

a) It allows for first turn kills with cards like Misty, which allows you to attach energy first turn and kill the active Pokemon first turn, allowing you to win the game immediately if the opponent has no benched Pokemon.

b) It actually removes compelling gameplay which you could have at the start of the game, because it makes the start of the game a lot more binary. It's either a mostly wasted turn or an instant-win condition. This makes the game less fun to play.

If this were more like the physical TCG, where you can't attack but you can attach energy, you'd have a better balanced first turn, where both players get to do things at the beginning of the game and they get to have to strategize more between the two, without sacrificing any of the accessibility that makes TCG Pocket what it is.