Remember when cloud was acclaimed as the simple solution to disentangling legacy IT infrastructure? Nostalgia isn’t what it used to be.

Amazon Web Services (AWS), at last count, now has more than 225 products from which to choose, from the classic compute, database and storage; to containers and application integration; to IoT, machine learning and blockchain. Want any help? You can thumb through the Well-Architected Framework, but it might take a while. In spite of various...