As much as the physical punishments were bad, it was often the psychological ones for the less able in the class looking back that were the most cruel.
I avoided it as I was reasonably bright (based upon the norms of the time), but some kids who Im sure these days would be in receipt of a SEN were called idiots, made to deliberately look stupid by teachers and generally pilloried for just not understanding a subject area in full view of their peers, who on occasion were also invited to join in.
It wasn't every teacher but there were a number spread across the subject areas.
Are we a bit too soft now ? Probably with respect to unacceptable behaviour; but at least we identify those who might need additional help due to conditions beyond their own control. How many kids in to 70s and 80s who struggled with Maths had dyscalculia or English had dyslexia or even PE had dyspraxia and due to a minority of teachers hated going to school which then went on to affect them in later life, its really quite sad.
As research into the conditions has discovered people who suffer from these conditions often have strengths in other areas which are often not valued in a traditional education sense. Thankfully some employers now actively encourage application from neurodiverse people as they see the real benefit in certain roles.