I've learned to qualify most statements I make as being "in my opinion" in the backroom so they don't come off as arrogant, and I don't have to give evidence or proof of everything I say. More out of laziness and clarity than anything else. More often than not in these backroom discussions, people challenge definitions of words; and many people have different interpretations of words, in spite of the existence of dictionaries.
To avoid quibbling over semantics and definition, I just toss an "in my opinion" after defining things.
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