Never been to Tokyo or Singapore, but if they're anything like Seoul, where I've spent months, riding a bike in the streets is both playing Russian Roulette and virtually impossible on account of the bad terrain (and for pretty much all the same reasons I brought up earlier). You also have almost no place to store them given the size of the average apartment. Outside of dedicated parks, I've almost never seen a person on a bike their either.
I've been to dozens of countries on almost every continent, and bikes are a very uncommon mode of transportation. That's why places like the Netherlands, where it is common, are so notable. If it was common, we wouldn't care.
Rather than being snarky, what's your suggestion for overcoming these practical and social issues?