I posted a question back in 2016. As an open-ended challenge it was on topic at the time, and now it's not, which is fine. Now the question has been closed, which is also no problem for me.
The question is, was closing it now really necessary? The question had no activity for years and I've barely used this site since then, so it seems a bit of a pointless rigmarole for me to get a bunch of notifications telling me that my five year old question isn't on topic any more. The notifications were a minor annoyance, but if it's multiplied by every person who ever posted an open-ended challenge, then that's a lot of minor annoyances.
If closing old questions is the site policy then fine, but I note from the relevant meta-discussion that point didn't seem to be resolved, so it seemed worth asking.
The question in question is here in case anyone feels that's relevant, but note that I'm not asking for it to be reopened.