Damn near every person I've ever met in my age group who has used a smartphone or computer has used it for every aspect of their personal lives to include the sexual parts of their lives. There is an expectation of privacy that average folks have on their devices. It's where they search for their most sensitive medical information, search for relationship advice, watch porn, and explore their curiosities without censorship.
I'm not sure where you are finding these puritan self-censoring non-techies who treat their devices as open books, but I've certainly never met them.
Wow, you (and plenty of other people) seem awfully defensive at the idea that not every social group shares the same norms as the groups you belong to. I wasn't even making a normative claim (or at least not a very strong one) just a personal observation.
I agree that smartphones are intensely personal devices, and that people should have a reasonable expectation of privacy. But there's more to be concerned about than just what corporations or governments can do by following the rules. I would say the average person who doesn't take nudes might be just as concerned about an angry ex, or "hackers", or just accidentally bringing them up while they show someone pictures of their new house (or whatever) as they are about Apple or the USG.
They might not even have a specified threat model, they might just really nervous about the idea of those pictures being shared forever on the internet.
If you have naked pictures of yourself on your corporate phone that’s 100% your fault.
The thing is, if someone has nudes of you on their phone, there's a non-zero chance those nudes will end up on the Internet. Maybe you like your odds, but plenty of people dont.
There must thousands of other reasons someone could take nude photos of themselves on devices they assume only them has access to.
I don't have a strong moral objection to using personal computing devices in that manner, but I think many people are nervous about the risks.