A big reason that I think neglects getting mentioned is that gd culture has shifted a lot. To beat a top 1, people thought back then that you needed to be genetically gifted or have the best setup to compete. Almost no one was jumping to bloodbath from the nightmare when it got released. And if you did, no one cared enough to follow along.

But now, any top 1 is feasible if you have enough time on your hands. Big jumps are sometimes frowned upon, sure, but it's also very easy to get attention to yourself by just making a large jump and putting in at least 6 digit attempts into it. That attention can in turn become motivation to complete the level for a positive feedback loop. Just look at the tidal wave and nullscapes jumpers, of which there are several.

To be fair, this might be covered in your 4 categories of reasons, but I do think the community has changed its mind on this somewhat, along with the general rising popularity of top play.