Maybe you need to zoom in more/try a different airport? When I try Google Maps on my local airport (one of the busiest in Europe), I can see the security checkpoints and the gate numbers just like what your Apple Maps screenshot is showing (and also a bunch of stores).

Edit: I just tried it with O'Hare as well. Seems you need to zoom in to about "20m" in the bottom right for the gate numbers, while the security zones are visible further away anyways.