Added time means higher costs. No price tag can be applied to the time that would have been spent parenting. You can't reconcile this kind of employee control with the recruitment of well prepared, innovative, critically thinking teachers. On staffing issues, I can see the need for more site-based control. When a team is required, there needs to be some meeting of the minds to make it effective.
Strong schools have strong teams.
Changes in this policy should be approached with extreme caution and sensitivity. I would support a pilot or experimental approach in the short run. We don't know what works best and neither does the District. We need some trials before imposing a District wide model on 15,000 teachers. Nobody has the answer ,least of all the State, but together we could probably design one.