Some Regions are larger than others. I don't think it would be a good idea for Region II, with 20 + teams, to wrestle through the semi finals. That would be 3-4 matches (based on using a 32 man bracket, you would have rounds of 32, 16, 8, and 4) for each kid that advances to the final. Now I know some brackets, even with 20 + teams, will only have 16 wrestlers per bracket. 3 rounds on a Friday night, could make it a long night.
The Semi's deserve the spotlight, as much as the finals do. It would be a shame to wrestle Semi's on 4 mats. That would be a Coaching and Spectator nightmare.