Rainer
Contributor
Because it requires my forearm be in front of me. What if I'm dumping gas at the same time, or reattaching my SPG, or a dozen other things that could be occupying my left arm as I flash with my right? Do you seriously think it takes significantly MORE time to flash extra 5s as opposed to reaching over to your other forearm? For us, it's such a rare thing to need to check each other's gas (we either know, or just go by signals for "turn" and "ascend") that its never been a concern to shave off one second from a dive. There's also less chance for confusion using 5s (e.g. take 2000PSI, for you I need to notice the difference between one and two fingers across your forearm, both of which might be in black neoprene, versus catching four flashes).