For billing, it's much easier for plans to be monthly not just by a set number of weeks. I realize I can customize per client for whom the plan is "copied to" but this takes extra steps since for my purposes, all clients are billed monthly, not weekly. I see this same idea mentioned elsewhere and I voted on it, but I'm not as concerned with the syncroniztion with Mindbody as I am just for the sake of selling/billing on a "monthly" basis vs weekly basis.