If you posted something and it seems to be stuck in some sort of purgatory

No. Every post I've ever made 'to Lemmy' has seemingly been 'published'(?) quickly, but I couldn't rule out that this was happening via fast manual approval.

I was mostly just asking out of interest. Perhaps out of a feeling that if there was moderation then I didn't need to think quite so hard about whether a given post was worthy of submitting.

Personally, I think the examples you provided would be perfectly worthy of their own posts! :)

Thanks, it's good to get a 'steer' on this. But are you including my "F9 barge landing perspective that I don’t remember seeing before" example in that? And if so, is that just because you hadn't seen it before either?

What if it had been something else, that already was widely known about? Maybe just let people down-vote the post? Or merely not up-vote it? Maybe we should only post if we'd guess a 60% probability that 60% of community members haven't already seen the post contents?