It seems odd to blame architects when their clients (often developers) have final say in what their buildings look like? Customers who want an old-fashioned look can certainly find an architect to design it.
Fashion is a key word here. Most customers - especially commercial developers - have a shockingly neutral sense of taste. Here is the budget, build the most fashionable thing you can. I think loads of modern buildings are essentially the same type of creative product as corporate video music. https://youtu.be/AIxY_Y9TGWI