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Not if one uses a browser without logging in, then it takes you to the beginning of time.
Yup.
The last read state needs to be stored somewhere, and in the browser is a bad choice as people want it to work across devices, i.e. if I read this on a desktop and then catch up on my mobile, then it should pick up last read properly and not jump back to the last time I looked on my mobile.
But then I need to store the state against something... i.e. against the profile. Which of course we don't have for guests.
So are all the other links. The "replied" one has the nice property of taking you to the latest post in the thread, which is why I suggested distinguishing it in some way.
Not if one uses a browser without logging in, then it takes you to the beginning of time.