Houstonian here. I’m guessing you’re in Plano. I’ve been all over Texas: cities, suburbs, small towns and many relatives’ and friends’ farms. I’ve also been to most U.S. states and several continents. What you’re describing is such an outlier that’s it literally sounds like a diamond in the rough. While there is hopefully a new trend among American planners to make this more of a reality for more Americans in the decades to come, for many years to come not more than a tiny fraction of Americans will experience what you’re enjoying. Until then, the most common American experience will be to hop in a car to do almost anything. And again, in most corners of Texas and the country, I have rarely seen people sitting on their front porches talking to people passing by - that seems to be a relic of stories I’ve read taking place in certain towns in the early 20th century. But I should come check out your area!
I grew up in Houston (ish, Clear Lake). I've lived in Plano, Far North Dallas, now Richardson. I had friends over a large chunk of the South side of Houston. Pearland, Alvin, The Woodlands, Spring, Friendswood, etc. Their experiences weren't too far off, save for the fact there's practically no transit (same for Clear Lake). Visiting friends inside the loop today, I have pretty similar experiences to what I'm talking about. In the end, still lots of free third places around.
And when I visit friends in San Antonio and Austin, I get pretty similar experiences. Neighborhood grill outs. People chilling in the parks. Excellent libraries around.
> the most common American experience will be to hop in a car to do almost anything
The question was, what were those non-profit/free public third spaces that are allegedly missing. I do agree, in many places there's probably a drive to those things, but they do still exist. And from what I experienced, they're busy.