Even AcroForms have limited support in mobile versions of Reader. A few non-Adobe mobile viewers have better support, but none are as complete as the desktop versions of Reader. Most have no support.
It's hard enough for third-parties to get AcroForms to work on the desktop. PDF viewers from both Apple and Microsoft corrupt PDF forms in a number of ways. Others from Google (Chrome) and Firefox are lacking in a number of ways. Trying to include XFA support, especially for dynamic forms, would be significantly more complicated.