There's nothing any more or less environmentally friendly or harmful with electric air taxis than there is with electric cars. Electricity has to be generated someplace and someone(s) think having a power plant a little further from a city is better than polluting cars in the city.
the FAA is working on the entire ATC issue. Airspace around airports is generally divided up in areas that line with runways. just as with helicopters today, there will be areas where air taxis can approach airports but, yes, it will likely involve air traffic controllers.
Air tax companies inclulding Joby are working on a network of landing zones in NYC and the LA area, typically on parking garages that have recharging areas for their planes.
First and business class cabins are outside of the reach of most people but it doesn't stop airlines from offering them or consumers from buying them. not even WN has a truly equal product for everyone since you can buy your way to the front of their cattle car boarding process if you so choose.
It is more telling that DL passed on zoom - which is now dead - but decided urban air mobility has potential. And they could have an advantage if Joby launches first, which is likely.