Extra time of two 5 minute halves because:
1. The best team on the day will win, that is what the grand final is about.
2. The teams can change players next week. This could disadvantage or advantage one club more than another, depending on who becomes available.
3. Makes all the efforts on the day almost irrelevant. Saturday meant nothing, it shouldn't be like that.
4. The players hate it.
5. It's a hassle to change, disrupts plans of players, officials, fans and other codes.
6. Completely unfair to the fans that attended. Some of them may have spent months saving or changing plans to accomodate and might not be able to attend next week.