Obviously for children regularly beaten badly it will have been traumatic.
For me though, I was smacked rarely. I have 3 memories of being smacked on the upper leg by my mother’s hand, aged between about 6 and 8. Each occasion was for being deliberately naughty and it sent a very clear message that I crossed a line. I don’t think it affected me negatively.
First time was when my mum had told me very clearly and repeatedly not to go into my the spare room where my aunt’s wedding dress was hanging. I knew full well I wasn’t meant to, but I did go in, and I touched the white dress, and when mum found me she gave me a smack for deliberately disobeying her. It felt deserved tbh.
Second time was when I was being persistently cheeky, and she warned me that the next step was a smack. I then answered back “no you won’t!”. So of course, she did. I had asked for it really.
Last time was similar, I was showing off in front of my friend, who was over on a play date, pulling faces behind mum’s back. She saw me, but I said to my friend “she won’t do anything, cause you’re here”. My mum politely asked my friend to go upstairs to play while she had a ‘word’ with me, and gave me a smack for being so disrespectful.
I was a little madam at times!
Looking back, it was my mum’s last resort. She would explain her expectations and give me loads of verbal warnings, but at the point when I became deliberately disobedient for the pure thrill of it - that’s when I got a smack.