Physical space -- or "geography" and the community defined by it, is not some "antiquated idea".
And just because one can have friends (or "friends") all over the world through the internet and modern communications, doesn't mean that where one lives is not important, and they should not care of it and try to improve it -- and yes, connect with nearby people.
If you slip and break your ankle on the pavement, or your house catches fire, it's those "antiquated physical neighbors" that will come to the rescue. Or not -- if they too consider the whole "community by geography" notion antiquated, they wont.
"Community by geography" is just another term for the place we live and the people in it. One might not care for most of them, by its sad to not care of any of them, and also sad not to care for the place. It's also a recipe for a decayed urban civilization, fewer local opportunities, and a derelict neighborhood.
Ever as I gain more experience with 1s and 0s, I find a greater appreciate for and a greater draw to my front porch.
Without going into neuroscience, physics, chaos theory, and what not, by acknowledging and embracing that I am human and not some abstract distributed, computing network, and by accepting the consequences of that, my life grows richer.
In this context, what I really mean is that a space should not be controlled entirely by the people who just happen to be there at the moment. Every space has a past. Every space has a future. The past and the future are always different from the present. That's as it should be. People who think in terms of "I control this space now, so all things should be about me" are thinking in a prehistoric mode I find distasteful.
Like, imagine if suddenly the fishing community decided to come en masse to HN and start talking and upvoting only fishing-related stories, while downvoting / flagging everything else. I think the present HN community should have the (moral) right to tell them to go and find their own spot, instead of taking over someone else's.
For an example, look at what that desire has done to the housing market of San Francisco.
I'm sick of being told that I can only think and live in some antiquated way because some people in the 1960s and 1970s thought it was a good idea.