Someone who gives good advice who can't justify it, isn't giving good advice.
Plus, if somebody gives bad advice, other people are likely to comment and point it out.
I think there are some kinds of things where you really do need raw numbers (this thread for example), or "which front page is most aesthetically appleaing for my website," and those kinds of things can use polls (as this thread does).
EDIT: On second thought, after reading what some others have said, I think there really are some Ask HNs that could use comment scores (but I don't think all of them need it).
Someone who gives good advice who can't justify it, isn't giving good advice.
Plus, if somebody gives bad advice, other people are likely to comment and point it out.
I think there are some kinds of things where you really do need raw numbers (this thread for example), or "which front page is most aesthetically appleaing for my website," and those kinds of things can use polls (as this thread does).
EDIT: On second thought, after reading what some others have said, I think there really are some Ask HNs that could use comment scores (but I don't think all of them need it).