All of AWS has changed significantly in the past 6 years. I think it's disingenuous to say that an outage from that era, for any provider, influences your thinking nowadays.
I'm not sure S3 has changed nearly as much as the rest of AWS, which is probably why it is so stable. Regardless, the point is that outages can happen to S3 as well, and have; just because it hasn't happened for a few years doesn't mean than 99.99% = 100%.
