By fenced in run, I was thinking more of a dedicated fenced kennel with shelter, typically with a slab floor and overhead fencing, not just a fenced yard. In some cases, hunting, cattle and other working dogs are better maintained in such enclosures as their instincts and efficiency are dulled when they become a household pet. IMHO, this is not irresponsible as the owners view their dog as a critical, highly specialized tool and will typically invest a whole lot more in their upkeep and maintenance than a typical dog owner who just wants (and values) a companion dog.
I do admit a good professional kennel is acceptable. Most people not big into dogs don’t get real good kennels.
Otherwise, dogs shouldn’t be kept outside. It’s not just for their safety, but for the rest of society too.