[Sailor Steve]

They actually explain that at the end of the article.

One thing you have to remember is that our entire history is made up of trying not to do things the way Europeans do. Couple that with the origin of the US as separate countries, or "States", binding together supposedly for the common good. Even then it was done partly because of outside pressure. We still to this day don't trust the European way of doing things. That is part of the fight between our political parties. One side wants us to be "more like them" and the other doesn't. This means that the US Congress drags its feet a lot. Of course any large body does the same.

As the article said at the end, individual US States are producing standards laws that manufacturers are following, mainly because they don't want to make two different products. European standards also control a lot of what is manufactured here for the same reason. Companies do want to sell their products overseas, so they meet those standards without being told by the home government.

As for the products that are still different, such as food and cosmetics? Well, that's an argument yet to be decided.