Indeed, especially for those few spots seemingly in the middle of the ocean where the cables converge it would be interesting to know what land masses (if any) are nearby. Right now this is very difficult to see.
I actually think there's a real unique and distinctive visualization caused by this decision. We're typically very geo-politically focused when we look to evaluate this sort information, but think about it without differentiating between land and ocean, without countries or borders. Think of nodes and edges in a graph, with the size/volume of edges weighing priority. Totally different way to view "earth".
Switching between this and Google Maps the answers appear to be, predictably in hindsight, Hawaii / Guam / American Samoa.