I have no problem With ATV when that say were they be long. When they go around closed gates or go cross country in closed areas I have a big problem with them.
A horse does not leave a well defind trail when they go cross country, Horses do due some damage to main trails but that is an exsiting trail and most trail will get repairs done by the forest service at some point. I have seen horse hunters & outfitters do repairs themself. If you have ever had to put a horse down due to a reck on a trail you'ld know why.
I have walked a cross a medow with elk on the other side, keeping the horse between me and the elk and the elk could care less that we were there. ( as Will Gerr said in J. Johnson Elk don't know how many feet horses have).
Having horses in camp can be a real pain and there is always something that needs to be done with them. you don't just pull into camp and turn the key off.
As for Guides I've seen both sides of that , prices are just like gasoline they are what the market will bare. Most guides and outfitters earn thier money, They must know the game,the country, keep thier client out of trouble, get them on game and if all that comes together get the game out.