No matter what, we have to sort things out for ourselves. It would be nice to see/hear something and know for certain that it doesn't have some hidden agenda behind it, but that is the way things are. Even in olden times I think it was this way, but today more people are aware of it.
Having a Bitcoin Champions isn't going to be a solution, because there is no way to determine if that source will ever be infiltrated with unknowledgeable/confused people. Find a couple of knowledgeable, down-to-earth people and listen to what they say. Always stay vigilant/skeptical, because even honest people can get things wrong even if they are an expert in their field.
I have learned a lot about Bitcoin/crypto currency just from this forum alone. I was able to sort through the bullshit. Well, hopefully. Who knows, I may be unaware of the misinformation I have been fed.
Your main point about considering subject matter and presentation with a grain of salt is correct, and even from purported experts and seemingly very smart people.
On the other hand, if some people have gained a lot of trust (whether in this forum or otherwise), and they seem to be presenting their content with genuineness, by default you may well be better off to give them more trust than you would do to others.
Of course, in the end, as you said, each of us remains responsible to use our best judgement, and we have to admit that sometimes we may get it wrong too. In this regard, not all levels of lacking in trust are the same since sometimes people feed us bad information by their own mistake, rather than by their intention, and sometime, nutjobs really believe the bullshit that they are spouting out. So the gambit of disinformation (or good information) and intention can be quite wide.
I have also learned a lot from the forum over the years, yet sometimes, I have troubles identifying whether some post are disingenuous or faulty in logic or facts... On the other hand, there are some patterns to bullshit, too, which help to identify, even if I cannot quite put my finger on what is wrong with the post, I am going to feel some level of discomfort in relying on the content of the post, and may well skim the information and disregard the information of the post rather than putting very much if any weight onto it.
I have found, also, that sometimes, I might run across a post that is questionable, and if I challenge the post in some kind of way by writing a response, then the response back to me (or the lack of a response) may provide me with some insight regarding the extent to which I feel comfortable relying on any of the information contained within the original post. So, yes, sometimes we can get a decent amount of information from the forum. We can trust and verify, and frequently, we may just get some idea or news, but will have to do some of our own research and tinkering on our own before we decide how much weight to give the information and even the extent to which we share our own insights.