i doubt that it's a bug, but as turnstep said above, it has simply not yet become necessary.

i have an additional idea with regard to the date information on people's user nodes. how about if the 'Last here' date was followed by a duration, like so:

Last here:

Wed May 25 at 21:25 (3 days ago)

i find that for me, the duration is a much better indicator of whatever 'Last here' is supposed to indicate than the date alone.