and as parent I am confident that some situation deserve a quick and simple reaction and a small slap is the best and most efficient way to handle the situation.
It's the easiest and most immediately satisfying for you, but that's something else. It does not provide a "learning moment", it is extremely open to abuse and you cannot know the effect it is having on your child.
you do seem to know A LOT of parents.
I do, yes. Was this meant to be an insult somehow? "You sound as if you've seen a lot of evidence for your position"?
And my personal lived experience is that the smackers are, overall, less good at it. Not just because they hit their children (obviously). I just find that the smacking attitude usually seems to go alongside an authoritarian position whereby the parent is more concerned with face saving and point scoring than correction for the child's benefit (this tends to become more apparent as the child enters adolescence, but you see the seeds in the early hitting). They are less patient and less emotionally aware. It's not, as I say, in a silo; it tends to be indicative of something that pervades throughout.
It sounds as though you want to make out that I'm claiming you and the others all beat your children senseless, even though nobody on this thread has said any such thing. But I do think that if someone feels a need to make this distinction, as well as bring up ordinary everyday parenting activities as some kind of attempted counterbalance, it's not a ringing endorsement of the method.