Note that having rollback in mind from the very beginning can also impact how a fighting game is designed. The happy path of rollback involves "hiding" network jitter in the startup animations of various moves. But startup animations exist for a reason, to telegraph intent to an opponent and give them a chance to react. For moves with very little startup animation, a rollback correction can update the state of the game to several frames into the hit itself, making many moves unreactable! This feels about as bad as being shot despite ducking behind a wall in an FPS (with basically the same cause). The "solution" is to have a policy whereby you design the game such that you increase the amount of startup animation across the board, to smooth out these wrinkles. In the worst case, this is even used to justify massive built-in input delay on every input! This optimizes the game for being played online, at the expense of being played in-person. The irony being that, while the vast majority of play will happen online, all the most prestigious events (funded by the developers themselves to advertise their game as an e-sport) are in-person.