I find it amusing that this argument still goes on. To me it is no different then arguing that you should either eat only chicken or only salmon. People have had success with both methods, and if what you are doing is working, then great, but if not, do something else.
The reason for trying to do something that you can not do is that you might just be wrong. There were many times where I thought my next rep would hit failure, and ended up doing 2 more. Also, going to failure requires good form. If you cant lift the weight with good form, then you have achieved failure.
HIT has treated me well, but I know how to do it properly, which many people unfortunately don’t. There are a lot of people who cannot go to failure, as it is a hard thing to learn. You also have to recognize when your mind is telling you that you have failed when you haven’t. I am not doing HIT right now, but will return to it every once in a while. At this point, I plan on doing it once a year.
I just wish I knew s much about diet as I do now. I think I would have grown more then I have. Now I am not humongous, and I have a way to go, but when I was doing HIT I got up to a 49 inch chest measurement. But my back so outpaced everything else that I have been trying to get the rest of my body to catch up.