Perhaps since the US is something like 26 times larger than Japan while only having less than 3 times the population, we can avoid making comparisons that don't make sense.
It's non sequitur argument since this 26x land does not magically spawn in middle of land starved urban areas. The fact that Wyoming or Idaho exist does not matter there.
The idea that the US has land starved urban areas is mostly a myth. Or more accurately, it is mostly a self-inflicted problem. Drop the urban growth boundary nonsense and embrace multi-core urban areas instead of trying to build supercities.
