Alison, my concern was for the interior. Abrasions between opencell and skin can deteriorate the neopren (mostly depends on neopren type such as yamamoto - and age).
I've once found a black powderish area on my shoulder or ribs (forgot) which seems to be left-overs from my open cell. I don't remember if I put any pressure on that area during the dive but that was my conclusion. Wearing a bcd+tank on an opencell suit outside of the water is something I'de try to avoid.
I think it's a small sacrifce to have some thermal lining on the suit to keep it alive longer. The temprature difference might not be noticable or even better by Elios's official view.
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