I second this. I was poised to dismiss your comment as facetiousness, and then suddenly realized that you are exactly correct. Why indeed should we prefer cars over horses for
most (but of course not all) applications?
Aren't we as technologists always preaching the benefits of technological conservatism, minimalism and simplicity?
Our environment has obviously changed in such a way that it's now difficult to re-introduce equine transportation on a mass scale (where would you park them in a city designed for automobiles?), but we need to think long and hard about the world view that led us to conclude cars were universally superior to horses. I suspect the argument comes down to "productivity", and the axiomatic belief that it should be maximized in all circumstances.
I think your comment actually is wise.