It's also IMO valid. CRUD isn't derogatory. It's also not particularly illuminating though. Almost everything is a CRUD app. If you get the fundamental data structures, access patterns, and control flow right for those CRUD operations, you have the foundations for what can be a successful app. And then you enhance it further - games add nice graphics, collaborative workspaces add good conflict resolution, social media sites add addictive recommendation systems. The core is CRUD but that doesn't mean the work stops there.