The point is that a horse can only do a dramatically narrow functions. It's basically a big walking engine. Conversely Jeff Bezos can tend a garden, build a house, create art, write documents, package goods, negotiate contracts, recruit employees, organise a company, care for children, drive a car, take out the trash, cook diner, etc, etc.

Comparing people and horses in terms of jobs they can do, and their ability to adapt to new tasks is so unbelievably dumb it's staggering it even needs to be pointed out. This is why these arguments for automation imminently putting vast swathes of people permanently out of work has never come true, in the hundreds of years it's been predicted.

Automation hasn’t put humanity out of work yet because humanity has been better at knowledge work. What happens when they’re not?

That's a good point, but talking about horses pulling carts muddies that to the point it's completely obscure.