Hmmmmm. I dunno. I love stump shooting, and think I do pretty well, but, if truth be told, if there were scoring rings around our targets in the field, I think we'd find we score there just about the same as we do on paper.
For me stump shooting is a lot more fun. I think I might forget those shots that are close, but not quite there. Can't do that with paper. It records the close misses. Or, put another way, the mind tends to remember the good shots, the poorer shots, not so much. I think that happens to me when stump shooting. When I shoot at paper, no way to deceive myself. YMMV.