Allow to modify/evaluate the same field in more than one rule.
I find it extremely limiting (and unnecessary) that I can only alter the behavior or a field with just one rule. If I need a rule that makes a field visible, and another that makes it required, I can't do that. Even with the help of sections, there are many things I cannot do. Plus, sections bring other limitations (some just aesthetic, but still, unnecessary), and when a Data Page has way too many sections, it breaks, literally.