Optional rules?
So how does a referee know how injured a player is without stopping to find out and without a medical degree?
So your advocating that referees should play on and take the risk with a players safety and welfare?
Yes under the current laws, particularly at the elite level.
If the play gets close to that position then they need to stop play or if they are of the view that it is a head or spinal injury.
The team doctor can come onto the field to attend to the player.
In my opinion the referee should err on the side of letting play continue.
If it quickly becomes apparent that the injury is very serious then play can be stopped. Assistant referee and TMO both have access to the referee via their earpieces and the team doctor can signal that it is a serious injury to further help alert matters.
People are reacting to this incident as if the normal refereeing process in the event of injury is to stop play immediately which is it not.