[rwnspace]

I think the lack of a stable is part of the appeal, most people don't have anywhere to put a horse.

[usrusr]

Horses outrun moderately trained cyclists only for a very short distance, on longer distances they fall behind runners. The main benefit of a horse is that you can carry more stuff with you.

[pmontra]

Horses must be fed even when you don't ride them. Cars and bicycles stay where you left them and don't ask for anything. But I won't leave a bicycle parked on a street for a week.

[PaulDavisThe1st]

Many apartment dwellers find even storing a bicycle to be at best a hassle, at worst almost impossible.