There is a certain amount of truth to this, but at the same time asking someone else to do all the work for you is just not going to happen (especially when they have already done it at least 3 times before).This doesn't invalidate people's requests for citation or supporting arguments. By the current logic we should simply listen to everyone because they could be anyone. This is quite obviously, self defeating.
For most of the theorycrafters or even just regular posters on this site there is a certain amount of assumed knowledge.
Linking a toon in ones profile to "prove" you have done the content doesn't prove anything as you can link any toon you want (as I stated, I could link Xav as my character in my profile and thus I have completed every encounter in the game).
As WarTotem said, the math doesn't lie. If you have a general concensus between users on any topic then it is most likely true. If you are still in doubt, the search function is top right and as I stated, most (if not all) topics have been covered before.