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Sure, you can try to attack my phone from a powered-but-locked state, but if you screw up and it reboots, or if you attempt any boot chain attacks, or if the battery runs out, you are *not* getting in. Period.
I don't know why nobody offers this option of split FDE/unlock codes by default (neither iPhones nor stock Android). It's such a massive no-brainer to increase security to basically "unbreakable" under an entire class of practical attack scenarios.
(And we can already do this exact thing for FDE on desktops/laptops, so it's not like it's novel)
I'd like it, but I'd guess it's human factors? If people only use the password when you turn on the phone, and they choose a more random/secure password for that, they tend to forget it and get locked out. Probably hard to keep the UI clear too.
Stick it under an advanced menu and put a big warning next to it then. Do it in the developer menu on Android if you must, that's already hidden by default.
If it were more common, then attackers would think very carefully before allowing the phone to reach a state where they need to go through boot. You're also assuming there's no alternate (remote/0click) way in under lock.
I'm not saying there is no other way in, I'm saying this eliminates the entire class of boot chain exploits.
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