I hear you. I certainly don't have the experience you do regarding all the odd contortions you have to go through to get your job done. All I can say is that as long as I get the membrane suit positioned right, I don't notice any restriction in movement. I can either move my arm or leg in the way that I want or I can't. And with it positioned right, I have not found anything I can't do - even with my thick undergarments. OTOH, with my thick undergarments, some movements in my XCS2 require stretching the neoprene and pushing or pulling against that resistance is harder. Without the undies the XCS2 is equal to the other suit. Of course, that's for me. Maybe my XCS2 is just a tiny smidge too small for me. I guess that is a downside of a suit that is intended to fit snug. If it doesn't fit just right, then it's going to suck. Whereas the membrane suit has a lot more forgiveness in its fit just by design.
I had never even heard the suggestion that a tri-lam requires less weight than a crushed (or hyper-compressed) neoprene suit. Them being totally comparable was one of the touted benefits that influenced my decision to buy my XCS2. Actually, what I had heard was that the XCS2 would require less weight because its inherently better insulation would mean that I would need less thick undies and/or less air for insulation. And that a shell suit being a looser fit would hold more air. Nothing to do with mobility. But, after everything I read, I was expecting to need more weight with a shell suit than with the XCS2.
My experience has been that the XCS2 does not need less weight than the membrane suit, but neither does it need more. I think the XCS2 traps more air because its folds don't squeeze down as much as the membrane suit's folds, so it ends up being a wash on weighting. And the less air in the shell suit makes it easier (for me) to manage trim.
I had never even heard the suggestion that a tri-lam requires less weight than a crushed (or hyper-compressed) neoprene suit. Them being totally comparable was one of the touted benefits that influenced my decision to buy my XCS2. Actually, what I had heard was that the XCS2 would require less weight because its inherently better insulation would mean that I would need less thick undies and/or less air for insulation. And that a shell suit being a looser fit would hold more air. Nothing to do with mobility. But, after everything I read, I was expecting to need more weight with a shell suit than with the XCS2.
My experience has been that the XCS2 does not need less weight than the membrane suit, but neither does it need more. I think the XCS2 traps more air because its folds don't squeeze down as much as the membrane suit's folds, so it ends up being a wash on weighting. And the less air in the shell suit makes it easier (for me) to manage trim.