I agree that the author has the right to self express. But in this case, I think the point being made is that it's less about what the author cares about, and more about the author's topic. They're writing about usability and design, while using (arguably) poor judgment and taste for both. It would be a little bit like an extremely out-of-shape person criticizing a marathon running program as being too hard on someone's body, or a homeless person writing that active investing is better than Vanguard's low-fee indexing model. The person's context doesn't make their arguments right or wrong, it just lowers their authority and believability.