I didn't realize you were the same person who wrote that blog post, and I edited it to include it when I realized. I linked your amended version, not your initial version if that's of any worth.
And you're correct it's not closed. I still stand by that particular proposal is going nowhere. You can make any proposal you want. It hasn't even moved to the design stage yet in 3 years, so I'm not sure why it's something you hang on to as a signal error handling is changing. Take generics for example, and the years (decade) of work that it took.
This is unsolicited blog feedback:
Your blog and writing style doesn't read like it comes from a place of humility and learning, but from a place of authority. Sometimes that's OK, but in your case, feels unwarranted. And the constant push to get it on to HN or Reddit or N other platforms so it can spread... Thought leadership as an aspirational goal has never been something I look for in blogs I read (I recoil and go elsewhere when I sense this is the goal).
I understand it's hard work, and you want others to see it, but just someone else's perspective.
Some blogs that I really enjoy (and I hope others emulate so I'm sharing):