The main reason everyone focuses on maple is that it is good enough, readily available and relatively common. There are dozens of hardwoods that are harder, stronger, higher rupture modulus and higher density than maple, but because they are tropical, you don't see them as the dominant tree in a forest where an industry can be built around harvesting a specific species. Where I live now, I walk for an hour and see almost nothing but Ponderosa pines. When I worked in Brazil and Colombia, you can't even count or name the different trees you see in a forest there.