I watched the "Leverage" video. His focus is on what kind of rod exerts most pressure on a hooked fish. By the time we get there, we've already cast and stuck - and these parts of the game involve other qualities than skulldragging hooked fish in. If you've ever tried casting a 2-3bb waggler well out with a short rod built to lever big fish, the point makes itself.
Towards the end of the vid, the dude asking the questions asks what if you're after soft-mouthed fish like skimmers? In other words, if you have more complicated demands of a rod than max leverage. He immediately concedes you need something a bit different. Reducing everything to "physics" apparently involves assuming you already have a big fish on the hook, are using strong gear, are sitting on a nice clean bank and you're in big hurry.
His dogmatic approach reminds me of those tabloid articles: Why You've Been Organising Your Fridge Wrong/Making Tea Wrong/ Blowing Your Nose Wrong All Your Life. If you've been using fishing rods for 50 odd years and have tried all kinds of designs and actions whilst putting plenty of fish in the net, it comes as a surprise to find you're thinking all wrong. I'd say the "Leverage" is one dimension of a complex equation.