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Readable standby instances is something AWS just recently added actually: https://aws.amazon.com/blogs/database/readable-standby-insta...

Though it seems to require you to have 3 instances rather than just letting you read from the standby... I don't quite get the rationale for that.

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Even though a hot standby is technically the exact same thing as a read only replica, it solves 2 very different problems (uptime vs scaling). Personally, I never want read only queries going to my hot standby, otherwise I risk the secondary can’t handle the load in case of failover. Probably a reason like that with AWS as well, as they are selling a “hot standby” product to ensure the uptime for your RDS.

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