Thank you for pointing out that the evolution has occurred.
We all know the drill... If they all looked like horses, of course, you'd be saying "ah, but see...they are all just horses!!"
In fact, that was my point. I realize now that my post could be read the wrong way. I was trying to say that those who wave away the horse evolutionary sequence as "varieties of horses" only know they're horses because of the work scientists have done. If they saw a live Eohippus without being told what it was, I doubt they'd immediately say, "Oh, that's just some kind of horse." In fact, as it would be almost as accurate to say "that's some kind of tapir" or "that's some kind of rhinoceros," since both those lines descended from Eohippus or something very much like it. As G.G. Simpson said, "Eohippus is referred to the Equidae because we happen to have more complete lines back to it from later members of this family than from other families." I have wondered if that's why it's often referred to as Hyracotherium these days, to avoid the implication that it's more a horse than anything else.