My logic of creating such feature to benefit the Stackoverflow was having little flow which is corrected by Lix's Answer, which I have accepted.
I think "record a question and even maybe an answer as private and then ability publish it at appropriate time", if it is not a current feature, can be a very good feature.
While in the process of storing questions privately, Stackoverflow search engine can play very useful role. SO search engine can suggest solutions for many. Which will in turn save a lot of time of the individual user and individual can gain knowledge faster. Any benefit to an individual user is in aggregate benefit to the entire community.
I am in a Learning Mode (learning programming, learning Scala). While continuously reading and practicing many questions arise which I may be able to tackle myself or may be I will need help to solve them.
Can I store/record question(s) on Stackoverflow as private?
If I am able to solve it, I will remove it or maybe if it seems useful for the community then I will publish it with answer.
If I am not able to solve it, find appropriate to ask to the Stackoverflow community then I will publish it to get the answer from knowledgeable community member.