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It wasnt taught specifically in my fundamentals class, but it seems a good way to communicate gas and allow the guy who just had OOA to calm a bit.
You're probably too recent a grad, the "show spg" portion was removed from the GUE s-drill maybe 3 yrs ago. The logic being that you either have enough gas or you're both gonna die (in the cave) anyway.
UTD is a bit more I guess unrealistic(?) too. Showing the gauge is supposed to be this point where you make a decision to eg return upslope or do a free ascent on a shore dive. Although you have to continually remake the "swim in" decision based on the actual consumption of the OOG recipient, something which I think is glossed over a bit.
Bottom line:
I've shown or needed to remove and point to my gauge on various dives and in various drills. Generally with novices who I am trying to ask "how much gas do you have?" when they are confused about my question and/or I don't trust the "flashing 5" hand signals I get back. Even with ideal buddies I think not having to worry about your light cord and long hose while restowing the gauge is a pretty important detail, just one more nauce of why its on the left.