“If it can’t reach the hardening level of a bespoke os built for security it can’t be hardened” is the equivalent of “if you can’t make your car as fast as the fastest car ever made you can’t make it any faster”

I don’t know what can happen.

What has been shown over and over again in the world of physical security is cellebrite (an Israeli phone hacking company) reporting in their internal marketing and training leaks that updated iphones are less exploitable with their hardware system than everything except for updated graphene pixels. Cellebrite is commonly used by cops. The most recent leak indicated that a locked after first unlock (afu), a less secure state than before first unlock (bfu), iphone could have enough data retrieved from it that the company would sell you their services to produce a hack unique to that device and software in six months.

Ios is a big target and has had exploits used by nations intelligence services before. It is extremely rare that they are zero-day, meaning that there isn’t a patch out, and if memory serves there has never been one seen in the wild that was both a zero day and not covered by lockdown mode.

I encourage you to look into the cellebrite leaks, the op list and the computer security worlds reporting of ios vulnerabilities and evaluate for yourself if it meets that bar. I use both ios and graphene daily so it meets my personal criteria.

E: In case I am being too detailed, adp encrypts your cloud data removing your capacity to recover your account through apple and the phones themselves are using encrypted memory and storage. Restart often and learn your phones duress options.