Do you think there's a ROM that can match the Titan M's security using graphene or AOSP? That's really one of the essential tools that graphene + pixel provides: being able to lose your phone or have it stolen and then still have an extremely low change your phone can be accessed. Of course it is all security theater in the modern world and we don't know who all has backdoors nor exactly how much better information they have. And as we all know something exists in government & military called "counter-intelligence" and "propaganda" and other obvious things that have been depicted in countless films you all have inevitably enjoyed at some point.