1) Ability to enter the roadway at any time, rather than after checking that it's clear.
2) Ability to walk down the middle of the roadway instead of the sidewalk.
And in exchange, we vastly expanded the amount of commutable land per travel minute, resulting in more space for most people. Also affordable inter-city travel and the National Parks. I'd do it again.
Just as suburbia is seen by some contemporary progressives as a great social evil, the crowded conditions of urban tenements were the great problem of our time to progressive visionaries back then [0]. Walking as a primary form of transportation, and the extreme density it required of the working class, was not a scalable, long-term, or humane solution. We should have leaned into streetcars instead of personal cars in order to spread out, sure, but then it'd just be some other kind of vehicle making the streets dangerous for pedestrians.
No great social problem is solved by drones being welcome at low altitude over crowds. News and public safety organizations already knows how to use real helicopters in that context. There isn't some latent use case for aerial photography that we're all suffering without, it's a nice-to-have, and the decision that it isn't worth the tradeoffs is much more clear-cut.
[0] https://en.wikipedia.org/wiki/New_York_State_Tenement_House_...