I've read almost whole SE Help Center, I am personally active on JoomlaSE by answering, reviewing and commenting posts almost every day, and I am slowly begining to understand what does Q&A network stand for, and that this is not a Facebook (Thank God for that) or any similar Social Network type of site(s).
But it still buggs me a lot when I see so many questions from first-time users (single digit reputation), which HAVE BEEN ANSWERED (and often answered correctly by veterans), but NEVER ACCEPTED or even re-visited by questioneers. Most of the time when I check their profile, the very same time when they asked the question is listed as 'Last seen'. It is more than obvious that for the majority of 'first-time users', question asked means 'only-time users'. It often happens that answers even get upvoted but never accepted.
I am almost certain that the lack of default email notification for the answered questions is to blame for the fact that people looking for quick answer never return to JSE (or any other site from SE network). If they would have been notified by system's email that someone had answered their question, I am sure they would have come back to see the answer. Then they would have either accepted the answer, or posted additional comment, thus begun to act on expected way.
I have checked whole SE Help Center and haven't found a word mentioning email notification. I realise that it sounds more Facebook-ish than creators of SE would like to hear, but I'll bet you any money that first-time users assume that they will receive email notification the moment their question gets answered. I am afraid that without something so normal and expected as system email notification of most important action on site, we will always have bunch of first-time questions which will never be revisited or accepted.
I have found similar but somewhat different questions on JSE/Meta: Old questions are still not marked as solved - What should be the action here? and Marking Questions as Answered
What are your thoughts on this matter?