Does having 2 possible outlets for dump valve introduce an additional failure point? Oh wait what am I talking about, I use a deluxe harness with all the quick release buckles I'm the poster child of failure points... and it's not like I ever really *need* to depend on wing lift. Even on the surface my lungs are enough. And it might not be too bad to have two rear dump valves. Maybe it would wean me off the right one and convince me to use the left one more like a proper diver lolMares XR wings have switchable kidney dumps. You can choose if you prefer left or right.
Honestly though, after working in a dive shop, I have developed a very unreasonable ugh reaction to Mares BCD & regs and suits - with all the little annoyances and how fast they break, they don't spark joy (not fins! their fins are sick!)