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Really different industry, but I know a little about how standards are created in the electronic industry.    I have created cable "standards" because I only had a 25 ft cable available to test, just as likely a 50ft cable would work just as well, but i never tested that.

If I apply the same reasoning to drugs then I get the following.

So typically the "reason" for a product saying "specifically" anything is simply because that was the way it was tested.   When getting FDA approval, they don't vary sites, so they don't know if another site is good or not.  If they did vary sites, it would make the approval process much more expensive.  Each site would need it's own process.   I have seen this in new drugs when I investigated biotech stocks and their new drug approval process, asking the CEO why they did certain things a certain way in their approval process.   It's usually because that was the easiest way to standardize their testing.