Compare the B-29 to the technology of the 1930s - - pressurized cabin, radar directed machine gun turrets, the altitude and speed it could fly. Ironically that the best results over Japanese cities were in firebombing at low-level and area attacks and not in the precision attacks which were -- (i am making an assertion here based on my own research) extremely effective in Europe.
Japan itself proved extremely challenging to high-level aviation due to the bizonkers jet stream over the islands. NE Asia has a very strange climate.