Then we'll just have to disagree about what is reasonable. If there's nobody home, I don't consider that reasonable. Both as a military police officer, and as a volunteer at an animal shelter, I've seen too many dogs tied up and left in a yard who either wrap the tether around a tree or get it tangled on something and can't get to their water on a hot day, kick their waterbowl over and spend the day without, hang themselves over a low fence, get mauled by a stray dog or pack thereof, get abused by passers by (with or without badges), or eventually contract heartworms from being a veritable cafeteria for mosquitoes. etc.
If you have to leave your dog tied up outside while you go to work all day, you either don't have enough respect for the animal, have too big a dog for your residence, or haven't invested the time and discipline in training the animal that a responsible pet owner should. A fenced outdoor run with shelter and water is entirely different, ut tying or chaining them to a tree, a post, an anchor, etc. and leaving for the day is simply irresponsible.
It’s not entirely different.
The fence may present fewer problems to that dog, but he’s still open to abuse, AND can also get loose and cause havoc. Fences rot and break, some dogs can’t wait for an opening, and destroy it, etc.
No dog should ever be left outside unsupervised. I understand if there are extenuating circumstances, but as a habit they should never be left outside with none of their people around.