Target: Escaping Disco-Era Data Modeling

Building high-performing Cassandra data models requires a query-based approach. However most of us were taught to build relational, normalized data models, which do not work well with Cassandra. Poor performing data models are often built with the idea of storing data efficiently, and then showered with secondary indexes to serve the required queries. Isn't it time that we learn how to build 21st century data models, without using 1970's techniques?