In line with the other comment on this post: I also am classified as “brilliant” by people and IQ tests. My country gave me an award for being a great inventor. But my memory is worse than anyone I know.
I can’t remember the lyrics to any songs, or the lines from any movies, or what I’m doing this week. I don’t think it’s a strong hypothesis.
My wife has a nearly eidetic memory, so marrying her was a game changer for counteracting mine :)
How do you complement each other in memory? I guess I can imagine, but it would be cool to know.
The things you list not remembering may just be a different focus. I was always amazed by how many movie details other people remembered until I realised they rewatched those movies many times and I never rewatched anything.
Similarly, being engrossed in tasks today (or rabidly learning/reading, as many HN readers do, as long as it's not the link being discussed) might make you not focus much on next week's calendar.