SHOULD author of a question on be able to answer to his/her own question?

No, I really don't think so.

Found out the answer: That's great but other people might also want to research for the answer and those people should be rewarded for their work. If it's a good question then the question might get upvoted and that should be the only reward in my opinion.

Updates views on that question: I think those updates would be more appropriate in the description area for the question.

A question poster on answering their own question would seem to me to be as weird as an Amazon Echo device asking and answering its own queries if it got bored.

If you want to ask questions you already know the answer to become a defense attorney. If you want to answer your own questions become a scientist. I believe Musing should be where one person asks and one or many more others can answer.