It's not a thin argument imo.Apple has always tried to position the iPhone as being different from the Mac for privacy and security reasons, but I think it's a thin argument.
True or False: Most people do their banking, store/purchase tickets for various events, make reservations and so on, on their iPads or iPhones rather than a laptop/desktop device?
Imo the answer is unequivocably yes which makes privacy & security on those devices a critical area to protect & a high priority for Apple