I dont really get this argument. Yes a few seconds more of open play leads to a few seconds more where someone could be injured but thats football. I rarely see someone complain about the advantage rule because it could result in more injuries.
I know what you mean but in cases where it's obvious someone is 10 yards offside it seems utterly pointless to allow play to continue. Of course, it'd complicate things further if linos were advised they could flag if it was "obvious."