What sort of game do you think the 2nd leg would have been if we had 2 legs last year? 48 point lead taking into the 2nd leg would be a diabolical spectacle. The grand final is decided on 1 day. There are no second chances, no best of 7 or best of 3. You are either good enough or not good enough on that one day in September.
With my idea it would just mean Richmond would have gone 1-0. They still would have needed to win 1 more game.