I would be surprised if this is true. Ancient civilizations were complex. When Pompeii erupted the population was around 10k just there. Having the chance to walk around part of it. Everything was dense and close and there were large city centers and markets. I'm sure the rest of Rome is just as big and same for the other cities and empires going back thousands of years.
And Rome (the city) had a population of 1 million or more, but that doesn't change the fact that demographers estimate at most a 10–20% urbanization rate in the Roman empire—meaning at least 80% of the population lived outside of cities in rural areas. And that's Rome, which had a notably high urbanization rate compared to periods before or after, not matched in Europe until the industrial revolution.
Compare that with an 80% urbanization rate in the US today and we're looking at almost exactly the inverse from where we were 2000 years ago in the Mediterranean. And it's even worse if we're just looking at the US, which had a 5% urbanization rate in the 1790 census and didn't even get to 20% until 1860. Where we're at now is simply unparalleled in history, and there's ample evidence that we're not well adapted as a species to this kind of density.
There's a huge difference between going to church on occasion (or even weekly, which was not always the norm) and living on a single acre of land with 30 other people.
I think this idea of villages of 30 people where you don't talk to anyone is just a fantasy. Even the Mayflower had 130 people to just set up their new town.
I didn't say that—I said you'd regularly interact with only ~30 people (give or take). You'd probably be on good terms with a few dozen more, and it's been demonstrated that we really lose the ability to have relationships entirely by about 100-300.
The average city today has about 8x that number of people per square mile. That's entirely unlike anything that evolution equipped us for, which is why I object to OP's assertion that we all descend from extremely social people. By modern standards we absolutely do not.
in what way do you feel like your expected to talk to anyone in our modern world? even here online, there's no expectation for you to respond to anything I said here
Most of us are descended from people who lived in small communities and rarely interacted with people who lived outside of them. It's only in the last 200 years (an instant on evolutionary timescales) that the majority of humanity ended up in a position where we have to constantly deal with more than ~30 people on a regular basis.
Sure, we spent a lot of time with those 30 people in the past, but calling that "extremely social" is pretty misleading in the modern context—today that kind of wording evokes a very different image than the small-scale village life that dominated our ancestors' lives.
I'm a hardcore introvert by modern standards, but for me that doesn't mean that I don't enjoy spending time with my small circle of friends and family, it means that when I branch out beyond that small circle socialization is actively draining. I'd have done just fine in village life, it's the completely unnatural modern world that is overwhelming to my social limits, and I get rather tired of extroverts telling me that it's just because I don't try hard enough to "exercise".