Earlier quoted context omitted.
> The problem is that login form has no analog in real-life, so in this one designer just went crazy for the sake of it. That is not a problem. A problem is: "it is hard to use", "it uses a lot of bandwidth", "people dislike it in A/B testing and buy less".
"it uses a lot of bandwidth" is exactly the problem that skeu-craziness is. Purposeless high-resolution backgrounds and animations waste storage space, bandwidth, cycles, and developer time. Time/money spent adding a fake leather texture is time/money unspent on functional aspects of a product.
So you're against textures full stop, not just skeumorphism? Because of course high-resolution textures are not necessarily skeumorphic.
> Time/money spent adding a fake leather texture is time/money unspent on functional aspects of a product.
Using a fake leather texture takes about as long as using some other texture or choosing a solid color or choosing which direction the gradient goes in... You're either spending time on design, or you're not. Even being minimalistic takes time and intention.