What happens when you train to failure?
Training near to failure is NOT a necessity for everyone (training in close proximity to failure is)
Proximity to failure is a training tool
When less is more (my “as little as possible, for maximal results” principle)
Some people don’t need to for a time, most people eventually will, some people never will
Recovery tax trade off
Effective volume of 1 working set to failure, compared to the same number of effective reps with multiple sets and RIR