There’s plenty of newer “boutique” buildings in Manhattan/Brooklyn with the elevator direct to apartment without a doorman. It’s not necessarily more expensive to do it this way if you think about it. You don’t need a lobby or halls on each floor for one.
Good point. It would make me super uncomfortable to have random people that haven’t gone through security ride with me essentially into my home. Not that I’m even the type of person that would want to live in these silly luxury buildings though.