It's the same with this rule as it is with the SP, people do mistakes even though they're well within their limits and should know better. You have to practice coming up from a performance in dynamic just as you practice the turn or the SP (which I learn the hard way).
No, sorry, I disagree, it is not at all the same as with SP. The problem is not in doing the surfacing properly - here I agree that you can train it. You misunderstood the whole issue here. The problem is on the judge's side, not on the competitor's side. I did not yet hear about anyone who was disqualified because of SP even if he did it perfectly, or about someone who passed the SP even if he failed to do it (though I am sure there are such cases too). On the other hand, when you view couple of videos from competitions, you can clearly see that there is a very high percentage of performances that ought to be penalized because of grabbing, but it happens only very exceptionally.
One way out of this situation would be better training of judges, and the other one is removing or seriously modifying the rule. I am afraid that relying on the skills and fairness of judges is not the good way to go. They are only humans, may be tired, upset, distracted, unconcentrated, emotionally in relation with the competitor, or may even intentionally abuse the rule - it is too easy, and there is very little to do against it. Unlike at the SP, where the decision is mostly quite simple and the judge can decide almost with closed eyes, at the grabbing/pulling/propulsing (both underwater and above) it is often on such an edge, that even if the judge is really careful and concentrated, he may not be able to decide correctly without reviewing the exit on video in slow motion.
And in fact it is not a problem only at the surfacing - also at turns there is too much ambiguity - although it is allowed to push the front wall with the hand, using the other hand as a pivot on the pool bottom is by some judges considered a violation of the rule, other judges ignore it, and many judges do not even have the chance to see it.
Again, it offers such a space for injustice and manipulation here that it is absolutely scary, and brings the freediving sport to the level of box or gymnastics, where the judge is almighty and often decides under the influence of personal preferences, external pressure, favorites ranking, mood, etc. I am strongly against any rules that allows for such uncertainty. On my mind touching or grabbing should be allowed within the 2m (or whatever else distance) from the wall, and before the surfacing - only in this way we can have just and equal conditions for all. Well, originally I voted to keep the rule with just a minor penalty, but since I changed my mind and am now completely against it.