Carrying more devices is not more convenient. Especially for people who either;
1. Don’t make many calls.
2. Make enough calls to use a headset anyway.
I am in category 1.
I carry my phone in the front pocket of a fishing shirt, opposite the Kindle in the other pocket. I use a headset so I can talk while working. The few calls I get are from management.
Where in my posts did I say that people would be carrying more devices?
I’m saying that people would be carrying just ONE device, or a PC in a pocket or hidden.
That “other devices” might just be wearable devices, which would be barely noticeable if at all. Watches and hearing aids are worn by people with not much by way of inconvenience. So, why not “peripheral” equipment which would serve as “eyes and ears”, while still being highly “wearable”?