I really don't have a problem with it. Its pro ball so are we really worried about the sportsmanship aspect of it?
To me its just another battle of wits in offense vs. defense. If the NFL wants to fine them for it, go ahead.
That being said, knowing it will creep down to the HS level at some point, as all this stuff does; I really don't want to be placed in the position of diagnosing injuries. The NF did a great job taking a lot of liability off of me a couple of years ago, I sure don't want it back.
Are we ever going to know if a player just suffered a cramp or not?