I mean, I use to store data in my model and have the controller doing the rendering like anyone else that has some kind of experience on how ugly the opposite would become, but to outright demonize state within html seems quite misguided as well

there are things that are massively annoying to do without sneaking a data-uuid and data-type here and there, like drag&drop or specific customer requests - if anyone has ever written a cms, imagine the customer coming and telling "I want this product image in black and white" - if you had data attributes around, it's a css two liners, if you didn't because you're trapped into a either-or mindset, you have to also add the image-bw class on the rendering code with "customer ==" and "product ==" checks