While I understand the concern something like this might have in a broader context, I can give a specific, concrete example of how this feature might have been valuable to me in particular.
In 2011, I asked a fairly obscure question (Is it possible to run Java3D applications on Nvidia 3D Vision hardware?).
I fiddled around with the problem over the next few weeks, eventually got it working and posted a solution. It's a pretty small edge case, but if my answers save someone else the hassle I went through, I'm more than happy to share it. Java3D isn't a particularly popular tag, so not a lot happens in there, and I honestly don't check it that regularly.
I did some more work in this area for a few more months, before shelving it and moving on to other things.
At some point in early 2012, a follow-up question was posted to my original question (Is it possible to run Java3D applications on Nvidia 3D Vision hardware in windowed mode?) This is a pretty specific example of a follow-up, linking back to my original question and mentioning me by name.
However, I never saw the question until this week (over a year after it was posted!) I probably could have helped out a year ago, and had the hardware and software available to be of assistance, but without some sort of notification, I probably never would have seen that question, except for dumb luck. Now, my answer is likely out of date, and the questioner is long gone.
If that connection could have been made a year ago, I think it would have provided some more useful information.