Training to failure is a pretty great idea for beginners and something that should be done often at any training age. Main reason being you need to take a set to within 3 reps of mechanical failure to get a proper growth stimulus. So you need to lean where the line actually is, and remind yourself often.

I need to admit I didn’t read your post well enough and so my response was a little off. 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. And there’s some debate in all of this, but I think it’s pretty well accepted that training to failure does not in itself provide results above other methods.

Training to failure doesn’t increase strength or hypertrophy according to Jordan and Austin (both medical doctors) at Barbell Medicine. https://forum.barbellmedicine.com/t/training-to-failure/11792

But they do use RPE where you estimate how close you are to failure in order to perform a number of reps for that set.

Is GNU Linux? Edit Shit I meant Is GNU Unix? now it doesn’t make sense