I personally love T20 cricket and the big bash. But there is a place for it. Imo the shield should run up until a couple of days before Xmas. From boxing day onwards , they play big bash(but the season needs to be shorter and games more condensed. Each team should be playing every 3rd day. There is only 8 teams.
Everyone plays each other twice and then finals. Don’t drag out finals with playoffs etc. Top team goes straight to the GF and 2nd and 3rd face each other for the other spot. It should be done by the time kids go back to school