We were ready for the internet. We were not ready for every person with a pulse being able to post to and read from the Internet. Web 1.0 was a beautiful uncharted frontier.
It's the Aqua interface, so that's actually Mac OS X.
Macs had access to the internet long before that, but you were on the right track that OS 9 was the first one to be marketed as "internet-ready." Saying "I'm not ready" in this case is the same as a "Setup networking later." options in current OSes.