>We are over a year into a pandemic which involved wide-scale lockdowns. Physical key exchange is a nonstarter for broad adoption. I think the emphasis is on t

>We are over a year into a pandemic which involved wide-scale lockdowns. Physical key exchange is a nonstarter for broad adoption. I think the emphasis is on the -ed in involved. That's a temporary condition which is already resolving in much of the world. You may also be overestimating lockdown compliance among average people.