This gives a lot of importance to small airports in small islands. Big international airports are surrounded by other smaller airports. They are associated with a tiny surface. I can not see how this representation may be of any use for airports.
This has a big influence on which routes a plane can fly. You can’t be more than a certain distance from a usable airport at any time during the flight to mitigate the risk of engine failure resulting in an off-airport landing/crash. See: https://en.m.wikipedia.org/wiki/ETOPS
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This gives a lot of importance to small airports in small islands. Big international airports are surrounded by other smaller airports. They are associated with a tiny surface. I can not see how this representation may be of any use for airports.
It doesn't seem to me that it's designed to be "useful" as much as just interesting.
Ability to divert in an emergency?
Absolutely. It's a map of closest airport for any location on earth.
You could do different versions of this for different classes of plane (e.g. select a minimum runway length).
This has a big influence on which routes a plane can fly. You can’t be more than a certain distance from a usable airport at any time during the flight to mitigate the risk of engine failure resulting in an off-airport landing/crash. See: https://en.m.wikipedia.org/wiki/ETOPS
And diversion airports of course vary with things like weather
I guess that would be useful in a case where you'd want a representation with an importance that is reversely proportional to the airport importance.