Unusable by almost everyone that's disabled, most of the elderly, and cannot carry any significant amount of goods.
Difficult to impossible to carry more than a single passenger as well, which reduces range and energy efficiency steeply when it is done.
You can negate part of those difficulties with variations on the bicycle, including tri and quad bikes, but you still run into range limitations that are incompatible with living anywhere but a city.
The posted text is yet another example of someone with a narrow view of how life actually works outside of their own situation. I used to love riding a bike. Can't now because of disability, but it also would have made my main job impossible back when I could still work. You can't ride a bike thirty miles across mountainous terrain in snow and ice to get to a patient's house. You simply can not do it with any regularity at all, no matter what condition you're in.
Even in cities, you're still limited by weather and time.
