I know it's a joke. If I was taking it seriously: I don't want to spend several hours getting to a job that's already say, an hour's commute. And then storing the horse at the job and then several hours back.
I remember growing up there was this Amish person who worked at one of the yokel gas stations. They would ride their horse to work and hitch it up for their shift, and then ride it home. It's doable!