The flip side of this coin: the “adaptability” of the communicore buildings was a function of their generic (maybe boring) facade in which an excellent attraction such as Sum of All Thrills could hide for more than a decade only getting scant attention. Were SoaT in a futuristic/distinctive building (maybe not as elaborate as M:S but still compelling) it would have been extremely popular; as it was, I only found it because of a review from someone who was enthusiastic about it. In retrospect, its location was the worst thing about it (although it kept its lines shorter). Similarly, it took me a decade to find Club Cool (mostly because I never spent the time to explore the giant indoor structures)
As much as I miss Horizons, WoM and the original Imagination pavilion/ride, there are many things in Epcot which have been improved. I don’t love the asymmetry of the new plan, but I really didn’t appreciate the communicore buildings.