Why there is a lack of transparency in US tenure-track job searches? I find it strange that most US departments have so little transparency in tenure-track jobs searches. In the UK the system is a little cleaner. Jobs are generally announced in one place (jobs.ac.uk) and the interview date is often set in advance. In the US there is no central list of jobs and it is difficult to determine where in the process the search is. Why don't search committees set a date for the short list to be decided at the outset and make it publicly available? Even for searches that move sequentially through the short list inviting candidates one at a time for interviews, could still send out a notification. It seems it would reduce the stress of the search for many applicants and not be too much work for the search committee.
There are several factors at work here:


Remember that there are several thousand colleges and universities in the United States. A central database of such jobs would be significantly harder to publicize and organize.
Most universities in the US are private. They are under no such compulsion to post their jobs on any particular web site, unless constrained to do so by the funding sources that are supporting a particular position, or legal requirements to do so. (To my knowledge, there is no such requirement.)
The more deadlines and constraints you build into the cycle, the more pressure you put everyone under—applicants, recommendation writers, support staff, and departmental faculty involved in the search.


So I think there are multiple reasons not to publicize the results of a search, and I think most hiring committees would be reluctant to do so. There could be a better job done of announcing searches, certainly, and that would make things easier (but again, the places that currently advertise would likely complain about losing their business to a central source!).