Q:

Make "last seen" on the profile page less exact

While reading What is the purpose of the "last seen" info on profile page?, I came across this answer. It describes various uses of the "last seen" field that can help people to abuse the system. 
If you can't be bothered to read it, it's basically a mini stalkers' manifesto for SE. Very creepy (some of the creepy bits have now been edited out, presumably as a response to this post)
As this field isn't particularly useful anyway, can it please be augmented in some way to reduce the potential for abuse? At least on smaller sites where it's much easier to use that data to infer information that's supposed to be anonymous?
I'm not sure exactly what form that augmentation should take, it could be as simple as "seen in the last hour" or "seen today/yesterday" rather than the more precise version we see now.
I know, I know, I mean who's going to sit there waiting and watching for these events to transpire just to make sure they can stalk a downvoter, right?
Trust me, it happens. On a site I moderate, we've lost good contributors because every time they downvoted a particular person's posts, they almost immediately got one in kind. Others who've downvoted have received comments on random posts from this person demanding an explanation for your recent downvote at xx:xx:xx on foo question:...
The perpetrator even bragged to me in public comments that he could identify anyone who downvoted his posts; the "last seen" data can help him to do it.
N.B. Something vaguely similar has been requested before, but that was ~8 years ago and for different reasons.

A:

It feels somewhat unlikely to me. Bear with me.
For this to actually work, you'd need to know who the user was. In which case, you'd already be sitting on their profile - and you could watch for reputation changes anyway.
It also wouldn't work if someone lurked a lot - I typically have a window opened up to MSE and SU all day (as well as chat) even if I'm not at my PC.
I'm not saying there's no underlying problem, but I'm not convinced this will actually solve it. 

On a site I moderate, we've lost good contributors because every time they downvoted a particular person's posts, they almost immediately got one in kind. 

This is not good, and probably needs someone to take a look at it. 

The perpetrator even bragged to me in public comments that he could identify anyone who downvoted his posts; the "last seen" data can help him to do it.

Excellent, you have an admission of targeted downvotes for the wrong reasons. I suggest collating all the proof you have and passing it up (maybe with a message to the community moderation team) to see if votes can be invalidated, and dealing with any behaviour that's non productive appropriately. People like this would find some way to lash out - comments maybe. 

