Testing iOS In-App Purchases Makes Your Device Unusable
medium.com
medium.com
The biggest being with subscriptions, you will have to clear 5-6 login modals every time you unlock your phone. The only fix is uninstalling the app your testing, which is usually the app you are working on.
Neglect of the developer experience runs downhill and consumers are the ones who ultimately suffer. I wish Apple would put some of their massive stockpile of cash into solving these solvable problems.