I was under the impression that most shops use paper tuning because they are limited in space. If you only have 15-20yds to shoot in it would be hard to walkback, group or even bareshaft tune with any effectiveness. Paper tuning IS easy but that does not mean it can't be effective if done correctly. No tuning method is effective if done incorrectly. If a shop only has the short range to work with better to papertune than nothing at all.