Perhaps then atleast the airports & terminals where these segreations are in place should be allowed to do 'sterile transfers', and new constructions out to be

Perhaps then atleast the airports & terminals where these segreations are in place should be allowed to do 'sterile transfers', and new constructions out to be designed with that in mind. Otherwise asking someone to get a US visa for mere transfer in an airport (as I understand getting a transit visa is as difficult as other types of US visa required to actually visit US, involving the same lengthy process, with personal interviews at the US Consulates, which in big countries like China, India, Russia could be located at the other end of their country), often to the same aircraft is very onerous. At the very least the transit visa should be a made a visa-on-arrival with a small fees. I sincerely wonder why the US want to hassle people who don't want to, don't intend to set foot on US soil, but merely want to change planes in there.