Ok, users are dissatisfied with maintenance windows, I can understand that. But I'd bet they'd be even more dissatisfied if their payment would be booked incorr

Ok, users are dissatisfied with maintenance windows, I can understand that. But I'd bet they'd be even more dissatisfied if their payment would be booked incorrectly because of a deployment glitch while they were ordering something. So in some cases maintenance windows are still the safest bet...