Are you realizing that risk spread out over time is what creates your downtime average? So what you are saying is that your uptime is so important that it is worth additional downtime. It's an illogical statement.
You should actually read the blog post. We are strictly increasing availability in addition to S3's already amazing availability. Not adding another point of failure and assuming we're better. In fact, I literally assume I'm shitty, so I build defenses so my fuck ups don't cause any issues.