Acceptable risk levels vary from project to project, and often it is a good choice to de-risk your UI so that you can budget risk to something more important to project success. I am currently working on a manufacturing support project that uses jquery in a progressive enhancement style, for instance, because that's the most comfortable level for the team, and we prefer to have the risk in the part of the code that gets into the business processes. This means we use a framework, LESS (for bootstrap UI) and we support web standards. We do not support IE6 because one cannot legally purchase a computer that runs IE6 in 2015.

The article is making statements that claim to be conservative, but were too conservative for businesses supporting them to survive. In 2006.

This is a bad article. I had trouble finding the date on it, but on the site's index it states that it was written in 2014. This makes it violently out of date at the time of it's writing. You should not treat it like a good article because it flatters your prejudices about new-fangled web development, because most of the content of the article is flattery. Not only that, it flatters you for not paying attention to what is going on. That should be a bad sign.