What you said was ...I never stated that it was "prohibited" - I stated that it shouldn't be done.
... which is probably about the closest to 'prohibition' that a trade body/whatever (with no 'teeth', other in relation to its members) can get.Industry advice is that they should not be included.
In any event, you have yet to even be able to tell us which body it is that says "they should not be included", the nearest you've got so far having beens "need not be included, which is obviously very different.