Stream categories

I’m new to Graylog and a bit confused with the usage of streams. I understand streams are mainly used to route messages (using rules) into categories and are also used/required to configure alerts. Why do we need to further categorize instead of just using the default category from the ‘All messages’ stream ?

For performance and to make life easier for users than using saved searches and to handle multiple index with different configurations (shards, replicas, retention policies).

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