This is exactly right. Here come the articles and studies. Have scientists ever really studied what bodybuilders were doing and what was working intensely? Not that I've seen.
I'll go one further. Insulin pre-WO works. It just does. Just because it's not scientifically known why at this moment means almost nothing. The science inside what we do (BBing PLing) is seriously limited in almost every area. It is now, and always has been. Just because muscle biopsies of rats forced to run on a wheel for 45 min or the muscle biopsies of 47 geriatric diabetics who were given xyz, means jack. Other times, when the science is there, the real-world experience just isn't.
Everything we do is practically all about defying logic and gravity. I'm a low carb guy. If insulin wasn't allowing for some additional creation of ATP and/or glycogen during a workout, then why do I go hypo halfway through a 60 min workout when without insulin I'd be fine?
Real world observations and philosophy have always (in all history) preceded science and the scientific method. I was going to bring this up in another thread talking about old timers. All because science is now catching up with what we have been doing for 30 years. Things that are now just simply accepted knowledge by people looking to lose fat and increase strength and muscle mass (like high protein, carb depletion and keto). I can hear the phrase "insulin resistance" on TV daily now where 20 years ago, few if anybody would've known what the hell insulin resistance was.
Remember just 20 years ago when it was low-fat everything? BBers knew it wouldn't work even though science and logic said it should. Want to lose fat? Eat less fat. We knew then that it was sugar (complex or simple) that was the real culprit of obesity - excess calories. Mixing fats and carbs simultaneously. All of it. Want lower cholesterol? Eat less cholesterol. How'd that go? In fact, I'd say 99% of the entire cholesterol lowering industry (medications, etc) is all bullshit. Have we really reduced heart disease with this multi-billion dollar per year industry? Research that!
I used to be an egghead, overthinking, over-sciencing everything. I'm too old for that now. Do what works for you, specifically tailored TO YOU, seek advice and experience, and then get what you get. A powerlifting record, a pro card, a state trophy, a state record, or nothing.