I downvoted you for the phrase "been there, done that". That sort of sentiment - I already know about this thing, so it's not worthwhile - is discouraged here.

I downvoted you for the phrase "been there, done that". That sort of sentiment - I already know about this thing, so it's not worthwhile - is discouraged here. Plenty of people may not know about it; it may not have value to you, but it may have value to them. If it's something you're familiar with, you can always add to the discussion.