More great points, I agree.

Also...it might just be me, but I find that I subconsciously have more respect for a person, both as a person and as a reliable source of information, if they present things with qualification, as you suggest. To me, it's a sign of humility and an indication of an appreciation for the complexity of any given subject if someone is knowledgeable enough to both field questions and demonstrate proficiency while also being careful to qualify and delineate between what's fact, what's generally accepted, what's their understanding, and what's their opinion or guess.

I listened to a podcast last year about TOP GUN instructors and the grueling process they go through to become subject matter experts in their specific subject, and one of the things that stuck out to me was that they're less worried about being right all the time and more worried about three qualities: being knowledgeable, approachable, and humble...with the understanding that with those three qualities, you're going to eventually get to the point where you're almost always right, with the added benefit that you've trained yourself to remove ego from the equation, so you're less likely to fall prey to the trap of clinging to bad information/belief/assumption just because you want to look correct.