I agree that the rules, and the protocol should stay as simple as possible.
On the other hand I do not quite share the opinion that watching the performances at WC was always exhilarating. All the performances were fantastic, many of the SP were clean, but many were under heavy LMC, and sometimes perhaps even under BO. OK, they were often funny for us, but that's just because samba became inseparable part of any competition. For anyone external to freediving, the images were horrifying, and I saw many such people turning away with disgust, or shaking their heads in disbelieve. I do not think any of them will ever permit their kids to practice competitive freediving.
I find it quite strange how today's freedivers easily accept LMC and BO. For most, not surfacing under samba means failure. But you should perhaps still remember that samba was not allowed under AIDA rules (as it is still not under other federations). And the purpose of the new protocol was not allowing samba. Its purpose was to remove the subjective role of the judge, and replace it by a protocol that is complicated enough that a freediver under LMC does not manage to complete it. Unfortunately, in this point, the protocol completely failed. Freedivers today are not only able completing the protocol under heavy samba, but they lock themselves on the line or edge so well, that often even a brief BO comes through.
Fortunately there are still top freedivers of the old school, who show that you can make even world records with a perfectly clean surfacing. Just have a look on the SP of Natalia Molchanova, or some other athletes. For me, these are the real freedivers, and not those who hang on the line, desperately trying to remove their mask while convulsing and shaking, and then managing it in the last second. Do we really want to go this way?
So if I can voice my opinion, the SP should be indeed as simple as possible, preferably not allowing any subjective judging (like the PBMM), but in the same time difficult enough so that a freediver without motor control has much harder time to complete it, than it is today.
So let's look at the options proposed in this thread - so far, most of them require much more complicated SP (more signs, using both hands, etc). This is probably not the way to go - some freedivers will be able to drill it and do it under LMC anyway, but there will be many more of DQ of clean performances because of stupid mistakes.
Removing the verbal sign? Well, perhaps. It would help reducing the number of some truly stupid mistakes, but in the same time some more LMC will pass through, because the larynx muscles are often blocked by LMC as first. So personally I'd rather prefer keeping it.
No necessity for removing the nose clip? Yes, perhaps. Finally there are people who have just a mask or goggles, or no equipment at all, so having to remove both the goggles and the nose clip is a clear disadvantage. But then again, it is the choice of the freediver to use or not to use two pieces of facial equipment. He/she can also attach the noseclip to the goggles and remove them both with one movement.
Something else, that would help simplifying the SP, while keeping it less subjective, but avoiding that BO and LMC pass through? No, so far I believe I did not see any such proposal here except of the ban on using lines, edges, and floats as support to lay or hang on. On my mind this is currently the only suggestion that would help improving the SP, and reducing the number of approved LMC and BO in the same time, and also removing the need for the subjective PBMM rule. It is certainly not perfect, but hopefully some other ideas come in.