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I don't understand why people update straight away. Leave it a few weeks/months. Especially as a developer.

Early adopters are the reason bugs are reported :)

iOS13 comes with a load of security fixes and new features - people are encouraged to update ASAP.

iOS13 comes with a load of breaking changes in iCloud. iOS12 devices and macOS apps (e.g. reminders) no longer sync with iPhones until you upgrade.