The fact that it is legal for him to do so is very different from saying that nobody is allowed to stop him.I'm in the uncomfortable position of disagreeing with both OB and Ian_Cook. First time for that. The law is clear, the tackled player can promote the ball forward.There are no restrictions or clarifications on that.
We all kow that when a player falls on the ball it is legal for him to get up with it, but the oposition do NOT have to wait for him to do so. In this case 22.4 (f) specifically provides one way of stopping him, so it is not an absolute right.
The point at issue is that BOTH players are required to act immediately. Given that, the tackled player is not in a position to reach out immediately - he can only do so if the tackler releases first, but there is no requirement in law for the tackler to do so. The remiaining option is simply to take his hands off the ball and get up.It is also clear that the tackler cannot prevent that until he releases and gets back on his feet.
You exaggerate. The referee must use his judgement, as he must on many other occasions.If if we then introduce an artificial measure of 'is it too close to the goal line?' then we need also to consider 'was it Jacques Theroux or Martin Bayfield'. At a metre out one would be stretching every sinew, the other would have the ball tucked into the elbow and just falling on to the line. That is a recipie for disaster.