@MartinSleziak Erhh, I said that I have the same opinion for askers...is there significantly more unregistered askers than answerers? If that is the case then I will revoke my comment and apologize for ignorance.

...and I have the same opinion for the askers, someone may just be too busy to maintain an account but that does not necessarily mean that a first post from an unregistered user must be of low-quality. And the questions on the homepage will serve as a good reference for unregistered users to see if their questions are appropriate. So I am thinking that the negative side will outweight the positive side of this suggestion.

@StefanKohl I am a bit hesitated on this suggestion since some of the experts are just too busy to maintain an account yet their answers are very important in clarifying their own works. Like this post mathoverflow.net/questions/266921/… which I cannot imagine anyone except the author can answer.