A fact about Mage Wars Arena is that sometimes a game will take more than 75 minutes unless it is cut short, even at the competitive level. On the one hand, modified wins are good when there is a clear "this player is going to win this game no matter what if the game continues" situation. On the other hand, it is not always that clear. Sometimes the player with the lower life after damage has a huge board advantage and if given enough time would make a comeback and probably win. Other times the players are neck and neck right up until the time is called, and a modified win would just be down to initiative.
To be honest, I think if we want Arena tournaments to be more fair in regards to this, we need some combination of the following:
-more time
-more space
-use time limits on the planning phase rather than on the whole game.
-instead of waiting for everyone to finish their games before starting their next swiss round, there should be no swiss rounds. They should be able to just start their next games as soon as they're done with their prior games. That way shorter games compensate for longer ones.
-Set up the number of games in swiss play that each participant plays so that, after swiss play is done, there is no need for a tiebreaker game. If you're running a 32 player tournament and you're not using the modified wins, then the number of games played per participant will need to be a multiple of 3. If you ARE using the modified wins, then there will always be some probability that you will need to use tiebreaker games in order to narrow down the participants to the top 8.
-Get rid of the modified wins and remove the time limit on individual games! And if you can't remove the time limit, then extend it.