I definitely agree that Smolov is unnecessary for a beginner of any age, but you shouldn't treat a younger trainee like a completely different case just because they're young. Intensity is measured in different ways - I'm using it as a way of referring to working as hard as you can when you're training and still pushing yourself, not in the sense of HIIT. I said you can ratchet intensity up assuming good form and proper weights are used and I still hold by that. Intensity is all relative in this sense, so I still think a beginner should be working as hard as they can, regardless of their age. I'm not advocating going full intensity when you haven't learned the movements yet, hence my inclusion of proper form. Any other approach would be mindless.