I lived in Brooklyn, I lived on Long Island, spent a summer in Seattle, and I live in San Jose now.
One can't speak for the entirety of the either coast, but no city in CA comes close to what NYC offers in terms of public transportation.
And what NYC offers is a true car-free lifestyle which carries you to work, leisure, and back home via public transport.
E-scooters aren't a reliable way to get anywhere yet, and who knows if they'll ever be, not to mention that they are not for everyone. My grandmother is not going to ride one -- nor my wife, for that matter, nor should the kids. But the Subway is a common denominator.
This reflects in the daily ridership. MTA carries an order of magnitude more passengers than, say, BART. The same can be said about overall transit ridership[1].
East Coast vs. West Coast is a silly comparison when NYC Metro alone has more ridership than nearly all other major metro areas combined (including both Coasts, the Midwest, and the South).
So it's really NYC vs. Anywhere Else, and Anywhere Else still sucks when it comes to public transport because, in practical terms, most people aren't commuting by public transport in Anywhere Else, but they do in NYC.
You can't slap a Lime scooter on a suburban development and call that "public transport". And a self-driving car is still a car, a glorified jitney cab if and when it arrives. And it's not going to solve the problems of the car-centric (sub)urbanism[2] anyhow.
The mistake the article makes here is a classic one: percentage growth vs. absolute value. Doubling from, say, 500K in a metro area with 7M population is going to be a bit easier than doubling the 14M ridership in a 20M metro.
As for the problems - people on HN of all places should be the ones who understand scale and that some problems simply don't exist when the scale is insignificant.
I want every city to be a public transit success story, but as it currently stands - the rest of the country will be playing catch-up for a long time.
[1]http://www.vitalsigns.mtc.ca.gov/transit-ridership
[2]https://www.technologyreview.com/the-download/611557/self-dr...
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TL;DR: NYC mass transit carries more people than systems in all other major metros combined[1]. Any comparison - including this article - is silly.