Thinking about this some more I want to make clear (as I said above) that the use of display mode in the bugtracker seems sensible ... my problem is with comments that ad_form become the preferred mechanism for displaying data in the general case.
For instance I don't see why we'd want ad_form to be the mechanism for publishing articles in a CMS.
Having said this I still regret the complexity that's crept into ad_form and the form builder to support a variety of features. I'm really concerned about the maintainability of the beast.