> By your simple reasoning, all iphones would be cracked, yet even the USA govt hasn't been able to crack into them.

I don’t think this is quite the right takeaway. What the threat model is for this is not that you’d be able to crack any iPhone you like in whatever circumstances, but rather more like jail breaking one. Jailbreaks definitely exist, and depending on your need, you’d only need to jailbreak one, once. Even with a per-device token, if what you need is to generate a validly signed photo that has been manipulated (say for a passport photo or forensics), you’d be able to do that.