I cannot but agree with you Mr York.
The whole issue does indeed, IMHO, need to be reviewed and a more sensible version of this particular competition rule drafted.
However, playing devils (or FA Appointments Officers) advocate for a minute can you imagine the outfall were a game to be decided as a result of the person sanctioned by the Referee (original or replacement) either not doing as instructed by the "new" referee or the "new" referee overruling them?
Officials get enough grief as it is, a significant part arguably understandably, without opening the door for more.
A scenario if I might....The Referee goes down injured and as there is no alternative I am pressed into service. Referees instructions to me (despite me being qualified) are merely to signal ball in or out of play. He will adjudicate fouls and offsides
Following these instructions I do not raise my flag for an offside which I know to be offside and am better placed than the Referee to judge. What would the response to me (and the other officials) be if that results in the winning goal?
Alternatively I do raise my flag, everyone stops on seeing the flag and I am then overruled (correctly) by the Referee.
What i am trying to say is that it is a bit more complex a problem to resolve than it first appears