Liturgical law is positive, meaning that it specifies what IS to be done, NOT what is prohibited. IOW, if it’s not in the rubrics or an accompanying instruction, it’s not to be done. Things do tend to get out of hand, of course, when it comes to “modern” liturgical practices, and so we have various Instructions, such as Redemptionis Sacramentum, which go a bit further in specifying certain practices which are reprobated. But, just because something isn’t banned in a specific Instruction, doesn’t mean that it’s actually permitted. For example, no instruction that I know of says that naked or even scantily clad dancers are forbidden at Mass. Does that mean they’re allowed? Of course not.