You're trivializing read-after-write consistency. It's actually quite a challenging problem for most applications, especially for anything web-based. Let's say

You're trivializing read-after-write consistency. It's actually quite a challenging problem for most applications, especially for anything web-based. Let's say you add a comment to a piece of content and then refresh the page. With a naively-implemented CRUD app, your comment disappears if your request's read query was routed to a lagging replica. This gets even trickier when multiple datacenters in different geographic regions are involved.