Thanks for the replies, but most of them haven't answered the question - I'm looking for advantages of having stages left and right, not more arguments against it.
Well, you'll need to buy one more bent fixed D ring, which will help keep your LDS in business.
And if you aren't careful, you'll trap your long hose, which might give your buddy an incentive to practice better gas management or gear maintenance.
(I suppose I shouldn't be snarky... stages on both sides should obviously keep your more balanced. It also could help you identify various mixtures providing another layer of protection against breathing the wrong gas. Neither reason is enough for me to put stages on both sides, unless I'm diving sidemount, when it becomes much easier and more practical to put one stage on each side. Not sure I could fit two stages on one side, unless I put one above and one below the sidemount bottle, and that just gets to be ridiculous. I put one on each side, behind my backgas bottles.)
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