Earlier quoted context omitted.
"It made me long for the pre-smartphone days in which I imagine travelers were forced to socialize with each other." Having lived through the horrors of the pre-smartphone days, I can tell you that this wasn't the case. See, for instance: https://i.pinimg.com/474x/1a/a1/7b/1aa17b28aad6df78a2e1d2016... or https://cdn-images-1.medium.com/max/540/1*U36hBj8i-C7JJJxS4M...
No, he's right. Until about 10 years ago, meeting people was an integral part of travel. You'd be essentially cut off from your friends back home (apart from maybe a daily email session), so you made new friends wherever you went. You'd go down to the common area of the hostel (or the beach bar near your bungalow in SE Asia), and strike up a conversation with pretty much anybody, since everybody there was traveling a…
Never ever done that and I did travelled alone a bit. I know one person pulling this off, all other people I know would not have done so. Once someone tried to befriend me too much, but I found that uncomfortable (personality mismatch mostly).
For that matter, most people travelled with friends or friends groups and not alone.
It is cool that you was such person, but most people were not.