TJ, I already said that I agree that consulting a professional is ideally the way to go, but also pointed out the issues with that.
My problems are not the same as the OP, but having dealt with wear, instability, arthritis, and fluid in my knee I have a reasonable perspective to give an informed opinion, in the same way that you give your opinions on a lot of things.
Yes, I would consider that any diagnosis of a knee problem by anyone without seeing a scan of the knee would be a guess – possibly an educated guess, but a guess all the same.
But my main point, that you ignore, is your comment about wearing a brace “often” being contraindicated. Only in rare, exceptional circumstances can I understand a knee brace being a problem, and that in the absence of expert medical advice therefore you are dramatically more likely to help a knee problem than exacerbate it by wearing one.