In reply to Jacob Shumway.

If all your data is in the cloud, sure you can run search or analytics easily. However, if you want to keep your data private in your data center for security or data sovereignty reasons and only selectively use cloud for old or less sensitive data, it is hard to do common search and analytics across a combination of on-premise and cloud based data sets. Hybrid deployments simplify that by making your cloud based data be available in the same network or security zone as your on-premise data.