Why and when to use DLRS in Salesforce (Declarative Lookup Rollup Summary)

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Features Summary
Rollup information between Lookup relationships not previously possible without writing Apex Triggers
Define rollups using standard UI declaratively, no coding required
Define filter criteria on rollups for example Rollup Amount on Opportunity onto Account for Closed Won
Supports Realtime, Scheduled and Developer API modes
Open source, available in code and managed package form.
Managed package has passed Salesforce Security Review and is Aloha enabled
Supports Custom Metadata, rollups can be included in Change Sets and Packages for easier deployment

[@josueramirez7247]

There are some limitations of the master-detail relationships that make some people not want to use them. First, it is hard to report on field history tracking for the detail object. Second, the detail records inherit the security of the parent object and lack a Record Owner field.