How many times does Stafford get roughed, face masked and gets no calls? Not to mention I don't think anyone has more phantom intentional grounding than Stafford. If the receiver runs the wrong route and the ball is way off, it's not grounding unless the ball was thrown to avoid the sack. If not, Super Bowl 36 goes to OT or the Rams get the ball back because Brady sat in the pocket and unloaded one way out of bounds to avoid a sack with no call.
Another perfect example against the whiners this season. Stafford runs out of bounds and gets a shove in the back. Not a violent shove or anything. No call, ok. Then later in the game, the exact same thing happened with Purdy and flags were all over the field, It was only because one ref saw that Purdy was still in bounds so they picked up the flag.
With the speed of the game, they refs could use 1-2 more bodies on the field so better calls can be made. It's not like the NFL can't afford it.