The purpose of setting the play clock to 40 following an injury time out for a defensive player is clear and obvious, if the clock will run. But, what is the point of a 40-second clock when the game clock will start on the snap?
Example: B99 intercepts a pass and is tackled and down. After the ball becomes dead, a player of the passing team (former Team A), injured during the down, requires assistance to get off the field. Even if the routine flow of the game is interrupted momentarily, there is no advantage gained by the injured player's team that would be offset by setting the play clock to 40. We'd give the intercepting team reasonable time to get their offense on the field, and get a play called, regardless. So, why waste 15 seconds of real time?
40 seconds might actually be of benefit, by giving the offending team a few extra seconds to rest.
Yeah, it keeps the rule simple. But with so many complaints by nearly everybody with the total length of games, it seems like we should take every opportunity we can to reduce total game time.
The same question applies to the 'helmet off' rule.
Them's the rules for now. But something to think about.
Robert