I don't like stock of any kind on the trail. They may benefit the few, but at a cost to the many. I don't like stepping in/around poo all day, not to mention smelling it, so someone with $$ to spend can sleep on a cot and drink cold beer out of an ice chest, while someone else makes a profit by providing those things in the wilderness.

Horses do have a history in the backcountry but their time has passed.

I also don't like to see the wilderness used a a place of business but that's a different issue.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.