[hrdwdmrbl]

Think about it this way: you have to implement the same amount of business logic in any case. The only question being discussed here is where the work will be performed. The author is talking about scaling. If you have 3 server insurance but 1 database instance, it’s better (generally speaking) to put the logic in the server because there are 3 of them. That will scale better. In the case of Postgres, even if you have replicas, they’ll be read replicas. If you put everything in Postgres you are putting everything in the bottleneck. You can add more server instances but you can’t add more database writers.