Cotton is really a great fabric. The article is absolutely right about the benefits of cotton. It's completely natural and does not cause irritation or allergies. It is easy to clean and very absorbent. So it's natural for cotton to be the preferred fabric for hospitals. Other types of fabric would be problematic and less convenient.
There was a period when I suffered from skin allergies. I was told my a doctor to switch to 100% cotton clothing and bedding. My allergies miraculously disappeared. Also, when I wash my cotton fabrics in hot water, I know that they are thoroughly sterilized and free of bacteria.