That won't help you let's say in a court proceeding. Yes, they are "only" recommendations, but unless you don't have very good reasons to not follow them, you are lost. (Good reasons could be closed, offline network and industrial PLC.)
This is not how technical specifications work. They are intentionally be supposed to be generic in order to avoid to repeat everything for every single use case and to avoid the pitfall to leave something out. For example, if one would explicitly list application A, application B, etc., some clever guys would certainly argue that the regulation does not apply, because they are using application C.
The recommendations apply to RSA signatures. Period.