It's interesting that historically, in France, the more prestigious a publisher is, the more bland the cover. Book covers with colors all over the place feel cheap over here.
And this french idea goes all the way to omitting any kind of blurb. It's pretty shocking. There is no information whatsoever on the book itself beyond author, title - and publisher's name because that's important /s. ... The book may as well not be on the shelf.
Oh I would love for my covers not to be blighted by "New York Times Bestselling author" or "Now a popular <TV channel> show!" and the like. Keep the blurb on the back, but don't pollute the cover!