I see what you’re saying, but economic =/= cheaper, especially when talking about design styles. In your example, it’s true that using base and moulding to cover unfinished edges is cheaper, but it uses so many more resources than the picture you linked. This isn’t even to get into more abstract things like attention economy or how Minimalism directs or minimizes visual stimulation. I believe Minimalism is a lot better at “getting the point across” than other design languages (hence being more efficient in my eyes).