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While I agree with you, "switch over to slave manually" just doesn't seem right. Who would monitor when to switch? Why would somebody want to monitor that? Having said that - there're probably solutions that allow switching when database is waiting for I/O

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RDS doesn't fail over to a slave anyway. You would need to do that manually.

If you mean 'I ticked the multi-az box' that is only in the even that the AWS datacenter crashes - it will move RDS for you to another zone. If you have services that cache ip addresses from DNS, you will need to rediscover the database.

They probably don't mean "manually" just "explicitly", as part of an automated failure detection process.

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