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Thanks-- understood. I've been out of it for a while and had no idea a large % were now being taught to donate the primary reg. Things changed since 2015 I guess. So I agree-- use the molded mouthpiece yourself and don't worry about donating it should a rare OOA occur.You are missing the point that the donor wants to donate the primary regulator, the one being used regularly. That is what is being taught by a large percentage of people today.
In all my dives, I have never been near a true OOA emergency. It is extremely unlikely to happen. If it does, as Don said, the OOA diver will be happy to get air in any condition. Don't sacrifice your comfort for an almost nonexistent chance it might provide a slight comfort advantage to someone being rescued.
On the other hand...
During the days I was teaching OW classes, it was common for mouthpieces on the instructional regulators to have to be replaced because someone had chewed through it. I could never understand it. In all my years and in all my dives, I have never had to replace a regulator for that reason. That regulator is very loose in my mouth, and I really don't think having a moldable mouthpiece would make much difference to me. I'm not sure I would notice.
I also agree that is curious how someone could chew through a regular mouthpiece, and I used one for at least 2-4 years as a new diver. Only reason I even thought of molded was one time off a charter in the Gulf of Mex. my normal mouthpiece was almost blown out of my mouth while descending the anchor line in I guess the "Loop" Current.
Then with the molded one I realised how much more secure & comfortable that was.