Thats ridiculous. Hes the current version of OW, saying they don't deserve to use him because they couldn't succeed with a different set of rules for how he operated prior is like saying someone gets an extra queen in chess because they beat their friend in a game of checkers the game before. Theyre completely separate sets of rules and using one to justify an advantage in an entirely different set of rules is illogical (and yes thats an extreme comparison but again, current hanzo is the best dps in the game). But yes I guess me pointing out how silly this is to do during an ongoing season is dumb despite the fact that literally no other legitimate competitive scene/league would ever dare completely rework the rules of competition during an ongoing season-tournament. Let alone in the playoffs.
Suggesting the best dps hero in the game currently is not a huge advantage to have is getting disingenuous (hes the #1 pick on PC-xbx-PS for the last 3 months). Suggesting a probability you have no way of quantifying to be near 0, when two other non playoff teams missed out by a mere two games, is also getting a bit much for me.
You can believe that rule changes specifically for playoff teams in your NFL scenario would be justified. The grand majority of fans would not which is why we don't see this sort of thing happen in any serious sporting league. Again I think changing things for each stage is completely acceptable and how it should be. But for the finale the rules should be played how they last were the previous stage, with any new changes coming the season thereafter. What teams did previously on an entirely different set of rules has no bearing on the whether they get special treatment with new ones.