There is a difference between different preferences and disagreements over "facts". I am under the impression that in this forum, most disagreements reflect differences in preferences. As such they can provide the stimulus for a thoughtful conversation that can change the way we think about an issue.

I can think, as of now, about one disagreement based on facts -- should we or should we not clean chains in order to get more mileage out of them. Assuming the we all prefer more miles/kms, the debate should focus on "is it worth the effort". But cost/benefit ratio notwithstanding, we are confronted with diametrically different advices, coming from credible sources, some saying that cleaning chains (with solvent) should be avoided (Shimano's position), others saying that we should (Wipperman, Sheldon Brown).

The "there is no right or wrong answer" applies to differences in preferences, so these "disagreements" will go on forever. The situation is different when disagreements are rooted in objective facts.