There's always new things to discuss, even if they're the same things. Because the people doing the discussing are new. For example, I've never seen those old discussions and I never in a million years would have searched for and found them.

I've found the key, when you're on a forum and see something discussed more than once, is to change your thinking. Instead of getting annoyed, think great, a new cohort of people will get to talk about this important topic.

This kind of reframing works in many different areas of my life and the older I get, the more I have to apply it to avoid becoming a grumpy old curmudgeon.

(Links to the old discussions are great though, they just don't need to be followed up by complaining every time.)