Why do you say irrelevant. I gave two examples of the relevance. Did I miss where you refuted that they demonstrated the relevance of why we are here?
If I believe there is no purpose in my continued existence, even that belief has implications on my choices. Whether I believe that or something else is extremely relevant.
Do you really care about what that ant outside your front door thinks or what it’s motivations are?
The purpose of your continued existence is to continue existing.
That’s a fairly heady charge for anyone.