[kleinsch]

That's a misconception. If you design your schema properly, evolving it isn't a problem. We use protocol buffers (forced to because we're integrating with Google) and in the schema, everything is marked as optional so they can add or remove fields in future versions of the schema. This puts the onus on your code to properly handle missing fields, but that's the same problem you'll face with any schema that can be changed. Google has changed the schema multiple times and we've had periods where our code hasn't been updated yet. It works just fine.