We need some way to not go up against decks that we do not want to play against. Instituting a Rule 0 would allow players to actually play against decks that won't either play some gimmick to win in 2 turns or something that can completely counter your deck.
This rule 0 conversation takes place at any sort of game day or event, it's discussed between the players what kind of decks they're running and then they can either swap or adjust accordingly.
Shuffler aside this is the biggest blight to this game because of toxic brawl commanders like Ugin, Sanar, Kotis, Maralen, High Perfect Morcant, etc that can make the game completely one sided with no response unless you're lucky, but the shuffler usually doesn't make it so.
If not a rule 0 then we need something to change in the programming that if a game is conceded before even turn 1 takes place the person conceding shouldn't be marked as a loss. No game took place, why is it marked as a loss?