Disclaimers discourage argumentative clash and take extra time to think of beforehand.
I like to think of possible holes in my arguments before I make them. Sometimes I discover minor holes that don't invalidate the whole argument but do reduce its force. (For example, the argument isn't universally valid but only if XYZ is true, and XYZ seems pretty likely to be true but we can't be sure yet.) Should I not point them out myself? Or are you thinking of some other kinds of disclaimers?
Sometimes these are bad, usually not. It's difficult for me to outline exactly what kind of disclaimers are bad because I think they're bad whenever they do more to prevent the earnest engagement of ideas than to help it, and determining which category specific cases fall in depends a lot on contextual things that I'm having a difficult time describing.
I know it when I see it, basically. It's easier for me to ask you to make recourse to your own experiences than it is for me to describe these kind of situations all by myself. Personally, lots of the time ...
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