I was ready to disagree, but he made a really good case. When he reached to the argument involving perfect form, I was encouraged to change my strategy for some exercises that I am not good at, such as pull ups and increase the sets and lower the reps instead.
Discussion
i think what he is saying without saying is training nervous system pathways is the foundation of lasting strength progress.
I think it depends on the exercise too. Some exercises are worth the risk of training to failure. Think high risk such as deadlift/overhead snatch. More prone to serious injury