I have a couple of arguments, even if you are spread evenly: * If you lose an AZ,, you are in a state of reduced redundency. * If you have intermittent drops,

I have a couple of arguments, even if you are spread evenly: * If you lose an AZ,, you are in a state of reduced redundency. * If you have intermittent drops, you can have lots of issues as it will be coming up/dropping out and cause issues. This will also have an impact on replication of services and cause additional load on instances in working AZs (RDS saw this).