Use case: Never having to maintain a NAT instance (or, worse, but necessary: failover NAT instances). That's how I tend to use AWS at the moment, with IPv4. Al

Use case: Never having to maintain a NAT instance (or, worse, but necessary: failover NAT instances). That's how I tend to use AWS at the moment, with IPv4. Almost every resource (except AWS services) has a public IP assigned, few have open inbound security groups, most have open outbound security groups (but the option to restrict is handy).