I think it’s probably very hard to quantify, considering the types of machinery that do many things neither horses or humans could do mostly bare handed - also need mechanics. I’m sure there’s some calculus you could tinker with here, but what we do have is the sense that all humanity is generally moving in the same direction vis a vis the tools we use to achieve things.

If it were without us entirely, what would even be the point of it all. I’m not saying we shouldn’t make our lives easier with each iteration of advancement, but what’s the cost of all the idle hands that now can’t feed themselves because of that advancement. Curious to see where the pieces will fall in the next industrial revolution.