If motion is frustrating for you in the stands, that makes even more of an understanding of why the numbers support it and why the best offensive minds use it. It’s frustrating for the defense and allows the offense to get more info on the defense
Motioning can totally ruin a cover 4 shell as well. I used to really dislike trying to coach in the adjustments for that with trips to the secondary and LBs, although with nickel/dime substitutions at the pro level, maybe it's not so bad.