I need to admit I didn’t read your post well enough and so my response was a little off

Sure, no worries

I think it’s important to point out that when you say beginners should train to failure often, this doesn’t mean every workout or every set of every workout, it’s just a tool that lets you learn where failure is and how many reps you can perform.

Definitely, training to failure should be done at least occasionally for this reason. Although I would add that if one simply enjoys training to failure on every exercise there isn’t any inherent problem with that. Tons of people bring every exercise to failure without it ever causing a plateau, it depends on your split and your recovery.

I think it’s pretty well accepted that training to failure does not in itself provide results above other methods.

Everything 0-3RIR is equally optimal when volume is equated. So any method that keeps you within that range can be made to work very well. The important thing is to make sure you’re not one of the 80% of people training waaaaay too light