That seems like an unwarranted assumption. The OP mentions it's the proficiency of the person who is donning it, and makes not a single comment about changing how armor proficiencies are assigned. In other words, my assuption is that the OP told us the change they wanted, which is not unreasonable. Your assumption is that the OP wants to make two closely related changes and is hiding one of them from us while asking for feedback on the other one, which is unwarranted. If they are looking for comments and we could only fully understand the first change in the context of the second change, they wouldn't hide that second change.