You miss good targets with no disc, a little disc, a lot of disc, and with a notch. You miss things because of the direction you are walking, because the ground it too fry or too wet, because of a powerline, a cellphone, a cell tower, sunspots, etc, etc, etc... everyone misses things everytime
BUT... if you want to miss even more good stuff, use more disc or notch something out... then you'll miss more good targets.
You also miss things if you hunt a place with one machine. I have one site that was pretty near virgin. Some folks had searched one part of it looking for a lost diamond ring... they dug some minnies etc, but no ring. I have hunted it for well over 100 hours, maybe over 200 hours.. over several years, with multiple machines... Istill make good finds, not as many, but I still make them.
Bottom line, YES... notch out pulltabs and you will leave very good targets. Sometimes a square tab is going to read like a nickel no matter what you do, expecially if it is folded over... or it could be a gold ring.
So, I think you should notch them out. Especially if you hunt around here!!!
J