Ahh I see you'd like to exist, that'll be 10 dollars please.

That's part of it, but missing third places are as much a symptom as a cause.

Because tell me, if you walked outside and your neighborhood was restructured and there were bars and a riverwalk and cafes and old dudes with funny hats painting scenes, would that actually help the huge swath of people who have never grown up in places where you go outside and know everyone?

Third places are more than places they're community connection areas, and yah it can certainly help if the physical locations are there, but the big ingredient that makes it work is that people who live around these places have a history already of going out to meet friends, coworkers, family, casual acquaintances you value the opinion of, and so on. You never ran down to Horace's shop when you were 9 years old with a $5 to buy milk for your mom, and it was okay because you knew Horace, everyone in the area knows each other, and people looked out for each other.

We're missing some deeply fundamental things in the modern world, particularly in the USA and dense urban areas. A huge one is learning to just talk to other people without shame or fear... a LOT of our space and life would become designed around this kind of life if we actually valued it. We are falling for the comfort trappings of suburban/apartment hell where you can see any virtual world from your flat screen and VR goggles and talk to an AI who will order you dinner without having to talk to anyone.