What else would you suggest I do with my pony? He's too small to ride and has a broken rib from a previous bad owner - so he can't drive. He packs light weight lunch boxes for us when we go on hikes - but that's no better than what a dog can do.
I honestly don't comprehend you're argument - we're discussing a style of learning, which can be done by any species. Are you under the false idea that clicker training is only for unmounted work? Because that's wrong. Clicker training can be used to teach any skill. Using clicker training you can teach them anything - including what every other training style teaches for mounted work, but so much more than that too.
We aren't limited to pressure and release.
You clearly didn't watch the videos I posted for you, as most of them involve mounted work as well - which I'm fairly certain you can't do with a dog.
My mare I use CT for mounted work, she's large and sound enough to carry a rider so she will be taught those skills. She's doing pretty fantastic too :) And every time I put her bridle on she gets excited and goes right over to the fence for me to get on. She knows she's going to learn some new skills and is excited to figure out what new skill she needs to learn to get the reward.
So saying that using clicker training we're better off getting a dog, you clearly don't understand what clicker training actually is.
It is a way of learning and can be used to teach anything a horse can physically do - anything. Please educate yourself on the subject before you go smashing it. Just cause it works for dogs doesn't mean it's limited to dogs - if you look at the first link I posted the woman who I've learned from (from her videos) worked with marine animals too.