I know you didn’t ask me, but in my view, as far as whether it should be in the ideas category, it’s fine but borderline. It’s a reasonable proposal and a sensible discussion, but it’s reached a point where it’s clear that there’s no PEP or major language change needed, it just needs someone to write one or more PRs and see what happens. I explicitly said this in the thread, FWIW. On the other hand, it’s not particularly close to the policies being stated here. To me that suggests that what’s needed isn’t so much exact rules which get enforced blindly, but a better understanding from current participants of how to make the category work well, a greater feeling of shared responsibility for both keeping the goals in mind, and helping newcomers understand what the category is for, and how to participate. Unfortunately, nobody seems to like generalisations and nuance any more 
Having said that, the discussion is now largely not helpful, because it appears to be people who don’t plan on doing the implementation work talking about things that won’t affect the implementation. That’s something that could just as well be moved to the help category (it’s “a bunch of people having an interesting conversation about stuff in the current version of Python”).
While this isn’t the same as “ill formed ideas”, it is something that happens a lot in the ideas category - it’s a form of the Belling the cat story - a bunch of people all talking about what they think should be done, but all assuming someone else will do it. It’s a common enough behaviour, and as long as the discussions die down fairly quickly, it’s relatively harmless. But it feels like it’s becoming rather too common around here. This is a variation on my previous “don’t assume we’ll do the work for you” point.
This discussion is ironically another example of this. We’re all talking about a pinned post, but who is actually going to do the work of finding out how to get the pinned post updated, presenting the new text, and making the change actually happen? No-one’s said they’ll do that yet, so there’s a risk that all this talk will come to nothing because we’re all assuming someone else will do the work…