I would just go ahead and delete that question. It's definitely not a good fit for Stack Overflow. It otherwise might not get deleted (though the attention brought to it from this Meta question might change that), but it should be because it presents no value to Stack Overflow.
The biggest clue to this is this part of the question:
- Try to limit answers to numpy functions
- One feature per answer.
- Give an example and short description of the feature, not just a link to documentation.
- Label the feature using a title as the first line.
If you have to give instructions on how to answer your question, it's not really a question.
What you've essentially asked for is a poll, not an answer. It's not singularly answerable, but instead solicits discussion and debate. As you're aware, such questions used to be acceptable on Stack Overflow. And some of them are popular enough that, while closed, they haven't been deleted. (Debate continues on what to do with them and how to otherwise archive valued-but-off-topic content.) But new contributions of that type aren't really accepted by the community.
As I look at the old question(s) in question, it occurs to me that a significant contributing factor to the unintuitive nature of this highly-upvoted-yet-off-topic content begetting further such content could be the lack of a creation date in Community Wiki content:
I was just about to propose a feature request, but it looks like there's an old one in place already.