This has ALWAYS been the rule. I don't think it was the paper that was so bad for our scissors, but all the OTHER stuff that gets cut along with the paper. I have seen the little plastic line from tags, take a DENT out of scissors. Also when someone picks up your scissors to cut someones bangs (you can end up with gunk on your scissors), hair products can make your scissors sticky. Cardboard (is a paper), but it will dull your scissors. So the RULE still stands in my house.