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The role=form is considered a landmark and not all form elements on a page should be considered a landmark. Sometimes there are multiple form elements on the same page, but several of them do not visible form controls or used to hold only input[type=hidden] or disabled form controls, so their should be no default role or maybe role=region so that it would only be a landmark if someone added a label to it.
Are there other examples where a form on a page shouldn't be considered a landmark? In the three examples noted, two of them, namely invisible form controls and input[type=hidden], could be handled with role=none, or even aria-hidden=true on the form element, to the degree that they don't expect any user interaction and are not visible. With regard to the third example, I'm not clear on the use for disabled controls that aren't part of a form that is otherwise expecting user input, and so would presumably be a reasonable landmark. Regarding use of role=region without a label, I remember the discussions but note that in ARIA 1.1 the region role is always a landmark and MUST have a label [1]. [1] http://rawgit.com/w3c/aria/master/aria/aria.html#region
HTML AAM is no longer an ARIA Deliverable. If you wish to pursue this issue please file at https://github.com/w3c/html-aam/issues