I think this should change, IMO. The two signals are confusing to clock operators and it just seems generally unnecessary. One signal looks better too.
Additionally, you're technically starting the play clock and the game clock at different times.
There is a process for changing mechanics and signals. You simply submit a mechanical change request the same way you submit a rule change request. These go thru your state office first, and then, on to the Manual Committee for consideration.
There may be a better method, but for now this IS the prescribed method and it has been that way for a LONG time.
That being said, if the clock operator confusion is a major concern, it seems spending 5 minutes with the clock operators in the Pre-Game is a more productive use of time that standing around telling jokes, or hunting stories, or both.