Maybe it won't be a problem in the Covid era, with zoom calls everywhere, but in the pre-Covid era Atlanta was a PITA for travel.
JFK you have to walk and bus between terminals. DeGaulle you have to bus to planes. LAX you have to walk between terminals.
ATL’s plane train means you’re always 10 minutes away from any terminal. And at least Marta runs into the airport. Atlanta public transport sucks but at least it’s to the airport. It’s weird how many cities don’t have trains going to the airport.
I’m not sure there’s any airport close to busy that works this well. I prefer smaller airports where you can just walk in (OAK, FLL) but they don’t have as many flights to places.