Songs of Innocence design elements:
Images - Cover photo, Band shot (leather jackets), three grainy images
Illustrations/graphics - Bootleg cover (the iTunes pre-release), Larry's tattoo.
Type - One typeface, one weight, one color, one size, on a solid background
Songs of Experience design elements:
Images - Cover photo, Band in warehouse (+ same image without band), Sian in helmet photo
Illustrations/graphics - Cover silhouette, blue radial gradient, Blackout wordmark.
Type: One font, one weight, one size, on a solid background
(Type in the newspaper is a mish mash of a ton of things that have no meaningful harmony, including setting the bulk of it in Times New Roman, possibly the most bland typeface in the western hemisphere)
Compare that to the wealth of images, colors, typefaces, icons, single covers, cover variants, on every album prior to these two. And I don't think anyone should mistake it for minimalism, because there's hardly anything intentional about any of it.
The REALLY confusing thing is how different the I+E tour materials are! The tour program is FULL of photos, cool type layouts, ink splashes, supporting typefaces, embossing, diecuts, etc. It's like the band has intentionally asked the designers to save all their creativity for the tour book, and to make the actual album artwork as non-descript as possible. It's baffling.