The comments, closure, and reopening of 'Who invented the ejection seat and what airplane used it first?' is the reason I'm posting this. Question lacks research, OP compares it to self-answered questions, yet no answer is posted, and there are different points of view (I'm neutral).
'Help Center / Can I answer my own question?' clearly states we can answer own question. But, I am asking about question bodies that do not show research, and OP already knows the answer.
My opinion, see my answer below (ha!), and please post your own.
Note: this is not about questions from new users or hard-to-research questions.
'Should we close questions for not doing research?' does not deal with self-answering, which is the point of this post and what OP hinted at.