> Many people willingly choose iPhones (even given these constraints), and would prefer a remote party manage their device's security.

I mean, but you're making a big assumption there! I buy iPhones in spite of those restrictions, because the only other options have worse processors and cameras, and because most of the people I know use iMessage.

I'd pay double the cost of a normal iPhone for a Security Research Device, if they were available to the general public.