As it seems you're more interested in polling a population that uses naked gauges than what is or is not DoingItRight. I'll caveat my previous experiences with the fact that my broken gauges all took place while diving with heavy twinsets and deco bottles, or in the case of one, moving twinsets on/off the boat.
My singles rig as well as my deco bottles all have naked brass/glass gauges and not a single one of those has ever suffered damage. Most the people you've heard endorse plastic gauges are using them on their stage/deco tanks, where they help lessen the degree to which those tanks are top heavy while slung underwater.