[Schroedingersat]

Depends on grandparent's definition of dense and city. You need density but you don't need tokyo, you don't need high rise and you certainly don't need lab grown meat or vertical farms.

You can pack a lot of people into a 3km^2 circle at fairly moderate density when you're not wasting 500m^2 (8 parking spaces @ 40m^2 then roads, misc infrastructure and setbacks) per person forcing them to own cars.

A well connected walkable rural town full of 3 story fourplexes and 2 story cottages all clustered within 1km around a main street and train station is completely fine.

A walkable city which is almost all under 8 stories and where large portions of the population live in row houses or five over ones is fine.

Houston or Phoenix is not fine.