And you don't need Apple's resources to make something better, just a more secure phone would have much worse UX. Just some examples for a much more secure phone, where you dont need Apple's budget:
- Runs some barebones Linux with minimal packages. An SMS app is an SMS app, not something that makes HTTP requests.
- app store is very heavily vetted
- forced updates, you can't dismiss update notifications.
- minimal attack interface, no smart connection features or accessories.