Dead serious question: remind me why you would rather dive a piston reg in a situation where being completely sealed is warranted?
As an actual cold water/under the ice diver, environmental sealing is important to me, so I dive diaphragm regulators. I’m just wondering what would be so compelling that you would be willing to deal with packing a regulator full of silicone grease, rather than switch to a diaphragm regulator.
Truly curious: no mocking here. My understanding is that flow-through balanced piston regulators are a little simpler, and can deliver a larger volume of air, though any modern regulator can supply enough air for any three divers to at least several hundred feet. If environmental sealing weren’t a need for you, then sure, take the advantages. But when it is, those don’t seem to be compelling enough to deal with silicone grease.
Please inform my ignorance.