Both of these comments are needlessly snarky. Although it is true that the RSS capability of Thunderbird has been around for quite a while, I enjoy articles that simply reflect the author's discovery or use case.

Like you, I was consuming RSS through Thunderbird around that time as well and thought it was really good. I have since moved to something else(many times) as my needs have changed.

In the spirit of HN, the poster maybe wanted a discussion of how the use of RSS has declined and walled gardens took its place which is not good for the longevity and usefulness of knowledge.