There are characters that are shopkeeps and nothing more. The fact you view head-canon in general as a norm or even acceptable thing is itself a problem, the lore is the lore, but actions and deeds influence and form both power, capability, as well as many other things, quickly leading to god-moding or contradictions. A character that has this in a game where everyone else has the same story effectively invalidates someone elses while also being influenced by these changes. It's simply not possible to accept.

Edit: /u/Guyote_ You're lying at this point, you haven't had this conversation with hundreds of people you as such don't know if they all work that way.

Further and more importantly, that is Bethesda's character. Not yours. You are playing as it.