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The city where I went to university was instead packed to the brim with duplexes. Most pre-1950s neighborhoods were 7/10 duplexes, 2/10 single family houses, 1/10 fourplexes (? square brick building with two upper, two lower apartments).
Lots were quite narrow, ~10ft wall to wall. Tiny front yard, rear yard is same footprint as the house plus a bit. Hardly any driveways, instead a mix of alleyway-adjacent and on-street parking.
There was still the possibility of having a loud neighbor, etc. But having 2x the amount of windows was so nice. Not choosing between window closed or traffic noise, fresh air that's not exhaust, etc.
It felt like the right mix.