You can look up whether a voter in the state is casting an absentee ballot with just their name and birthday?
Gosh, if I were a criminal, there's an awful lot of homes that are likely candidates for robbing now that a list of "who is not home + their address" is public.
There are much easier ways of finding out whether or not someone is home than looking up if they are going to be voting. Just find out if everyone living there has a 9-5 job, for example.
What exactly would the use of that be? I have not the slightest idea what mine might be. It wouldn't surprise me at all if I have several, as I have registered in several different towns across multiple states over the years, and I don't have a lot of confidence that those records are cross-audited and resolved.