I don't think anyone is suggesting that low value cards CANT be included in skill-test decks. There are many examples to the contrary.
I myself said "included with caution, and in moderation". I think that's fair to say. One must build and play a deck carefully, to balance value and pulls.
I too think we have the makings of a strong low-value horse deck. But Rope and ride has always been clunky for me. Run 'em Down is very strong, and could contribute to a cool horse control deck. My experience is that (to date), low value horses tend to flop in a shootout. It sounds like your experience has been different. But either way, this card will help.