people weren’t meant to be around that many people
There’s a middle ground between a population living on top of one another and sprawling suburbs. I would strongly argue that humans are creatures that thrive on social interaction. Today’s culture has twisted that on end driving us away from one another - THAT is unhealthy.
I do take the point that crowded environments sometimes aren’t good for our physical health. Indoor plumbing and sewage systems solved that issue on one hand, but on the other hand we just lived through a pandemic that may or may not have been exasperated by close living quarters.
Maybe if we were less prone to be dicks to one another (because governments and corporations thrive on our anger, fear, and division) we wouldn’t have been so polarized during the pandemic and had saved a few hundred thousand lives.