I don't think mocking is constructive or called for. Generally accepted good practice on appropriate dives is to carry two knives (preferably small and carefully located), a small lamp is useful even on an open ocean day dive, and an extra mask in a group can be a life saver. And so can a redundant air source.if you want to strap on three tanks, two knifes, a pair of scissors, 3 spear guns, one of those Co2 injector things, 5 light sticks, a big flashlight, a small flashlight, an extra mask, a whistle, a mirror, and some arm floaties, then I say go for it
If you take a spear gun scuba diving in Belize or in a number of other countries you'll have your card confiscated, and probably worse.