The author then identifies a commonality between these trends, that they are all “average”. I don’t quite see that commonality, it seems a little strained. To be frank, the stronger commonality shared by all these styles is “the author despises it”. But there sort of is something there, “average” does kinda capture something they have in common, so I’ll buy it for the sake of discussion.
So, the author has discovered the current overall aesthetic of the age. Maybe from the inside it feels like it will consume the world and nothing will change, but from the outside it’s just the current overall aesthetic of the age, there were others before it and there will be others after it. You could write a very similar article about the Victorian period, maybe titled “The Age of Ornate”, filled with complaints that every field seems to be obsessed with adding a million curlicues and embellishments to whatever they’re making. The Victorian era (in architecture, fashion, etc., basically all the same categories mentioned in the article) lasted for 70-odd years or so, I bet it felt similarly never-ending and all-consuming to some people living through it back then.