In gymnastics the appeal is against the judges scores mate. In horse racing, a sport with a bunch of horses jostling for position they uphold protests if one horse is found to impede another horse. This in turn changes the entire race and the one that gets impeded doesn't necessarily win but the winning horse may not have won without it. Still happens because that result is, in their mind, better than a horse winning unfairly.
The line would simply be drawn at try rulings. You can appeal the awarding or non awarding of a try. The result of which would either be a rejection of appeal and perhaps a fine to dissuade idiotic appealing or an upholding and the awarding of the try AND goal or the disallowing of the try and removal of those points. Any subsequent play is only hypothetical anyway and as I demonstrated before if there is a dubious call at any stage during the match, it wouldn't take long before coaches started encouraging players to play as though the call goes against them, which removes any real influence the post game appeal would have anyway.
I am not saying it's the saving grace of the game but I just believe that making the correct decision is important and the fact that that decision tonight could and most likely will cost the Tigers a shot at the finals now that they can miss out even if they win both remaining games (and tonight they proved they'd compete for the title tbh) is enough of a reason for me to overlook any other issues that may arise from an appeal. It is more important to be right than to be simple or easy imo. For teams to lose a game because of an appeal would be simply them losing the game due to a decision being correctly adjusted post game, nothing more or less. It would be nowhere near as bad as losing a game because of a dud call other than the taking away of the jubilation of winning, but again getting the right decision is more important than annoying or hurting feelings.