And what's worse is the "sandbox" for testing behaves completely different from the real store, and has random undocumented downtime and bugs that you only find

And what's worse is the "sandbox" for testing behaves completely different from the real store, and has random undocumented downtime and bugs that you only find out about from other people reporting it on the developer forums. And creating, logging in to, and keeping sandbox accounts from contaminating your real devices is also a PITA.