
I don't believe that it's putting a human viewpoint onto dogs, although there is a lot to be said for our almost desparate need to find "dominance" and strict heirarchies in just about every species we come across.
I believe it because it's what the evidence suggests: that some dogs can show dominance towards others, although on the whole canine hierarchy is extremely fluid and often nonexistant in a domestic setting; and that dogs cannot be dominant over people, nor can we be over them. The study that first brought this theory to life was flawed in quite a few ways; and dogs are not wolves and as the most up-to-date information suggests, did not even evolve from them but from a common ancestor. So even if the initial studies were correct about hierarchy in wolves, it still would not apply.
Studies done on dogs - feral populations, observations of domestic groups - indicate that where there is a hierarchy, it varies hugely between inviduals, different groups and so far as minute-to-minute situations. And as Tommee says, a truly dominant dog, when one exists, does not need to show it physically: they are very calm, confident animals. I have had one of those so yes, they exist and I have seen how mine behaved around the others - there was no humping except in play, no tension, no nothing but that confident, cool control with pointed looks.
The article you yourself posted even says that humping alone is not a dominance issue: "In a recent article on mounting, Peter Borchelt, Ph. D., a Certified Applied Animal Behaviorist (CAAB) in New York City, noted, “Mounting could be part of a suite of behaviors associated with aggression, such as high posture, resource guarding, direct stares, and threats and standing over. But mounting, in and of itself, doesn’t indicate a status issue. By itself, mounting might not mean a lot.” (cited in Hecht, 2012)."
Here's an article by Victoria Stillwell, an excellent behaviourist who is very much up to date with the theories behind dog behaviour:
https://positively.com/contributors/why-does-my-dog-hump-everything/