Earlier quoted context omitted.
Sure, but medieval European art generally sucked. (Call this a hypothesis if that helps.) Compare the damn cave paintings of buffalo to most medieval European art. Some of the 10k-year-old stuff is much better observed. Europeans between about 500 and 1300 mostly couldn't paint. I'm sorry about that. It's just not always taste. Sometimes it's taste. Sometimes people are bad at making art.
I think that the medieval art article is making a different point. The art there had a style that was dictated by its purpose and the beliefs of the artists. For example, most of the examples given in that article are illustrations from manuscripts. This was something (as far as I know) that was new in the western world. The idea that books should be illustrated. And being before the printing press was introduced, ea…
I'm not particularly basing my opinion on the examples in this article. It's easy to see that a lot of surviving European medieval art sucks. Maybe "surviving" is the problem. Maybe the good stuff got all smokey from being displayed and only the leftovers and student paintings, in storage, have survived.
On illustrations, everybody can see the difference between Durer and most medieval stuff. It's not simply style or taste.