We can if we tear up most of the cities and small towns that exist today, like I said.
The cost-benefit of doing so.... takes a long time to pay off (if ever) and forcefully dislocating people like that generally isn't popular. Public transit would be great, but the argument needs to be a lot more realistic to how we retrofit public transit for our existing cities, and focusing future growth on making it compatible with public transit. It's not realistic to say "We just need more public transit, Europe has it figured out" when our cities and towns are laid out way differently. Obviously re-zoning certain areas and moving businesses closer to suburbs is a start, but it isn't going to be as simple as "build cities like Europe" because the cities are already built.
Interesting, I know personally one of my concerns with self-hosting an individual Lemmy instance (after losing my first account to the Vlemmy.net shutdown) was the threat of being held legally responsible for things cached on the server. Say someone uploads something illegal and my server caches it. Seeing it as an option to turn that off is nice, and for an instance only meant to be used by one person I'd imagine caching won't have a huge impact on load times