New answers tagged comments
Something like this would inform the user that longer answers are welcome, but you would want to do a better job than I have done in the image below; formatting the link and the "optional" tag so that they are obviously related. As my example stands, some might think that the question is optional, which isn't good.
Showing many text areas for every single question could add too much friction. Showing many toggles is less friction but still more friction than not showing anything at all until required. I would suggest that you automatically show the comment text area only for the question currently being answered. Just make sure the place to comment doesn't demand ...
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