I don't know how you get from my post to mifune about breathability to that conclusion.
What I am saying about rubber and plastic is that if you understand the materials and the way they work together; if you understand and value leather for what it is; and if you value being logically consistent and objective, then every argument you can make, every rationale that you come up with for rubber outsoles is equally a valid argument for rubber uppers.
We don't value leather for the characteristics that Topy and Danite and naugahyde bring to the table and, yet, their whole raison d'etre is as a replacement for leather.
I didn't believe this when I first started as a boot and shoemaker but I have learned...here, if nowhere else...that there is a certain percentage of the population for whom substance (as opposed to "style") is irrelevant; for whom nuance and the concept of excellence is fundamentally incomprehensible. Their priorities lay elsewhere. They "know the cost of everything and the value of nothing" and there is little anyone can do to effect the kind of sea-change in attitude that would open their eyes.
At the same time there is a percentage of the population that revel in learning. That actively seek to understand...at every level. And there is little anyone can do to discourage them.