awooga83 Like I said I've only ever seen two kinds of stutterers: 1) the kind who are not very good at penalties anyway, and 2) the ones who lose confidence in the moment that they can take it in a better way.
My guess is that if you're shit at penalties (and shooting in general) anyway it probably doesn't matter much, because you're unlikely to score in a shootout. Maybe it adds a small element of unpredictability to those guys? If you're Harry Kane or Mbappe you should be ashamed though.