Please whenever you envoke any model, have a sense of scale or region of applicability of the model, no model is true in all cases unless you're religious. The point the GP is making is at the scale of a F500 it starts to make less sense especially if you already have the infrastructure, the expertise, the experience, and so on. AWS is going to manage your VM better than you at your 3 person start up, but the economy of scale / specialization arguments work less well when you have an experienced workforce and developed system in place already and you're one of the world's largest logistics companies.