nereas
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If you planned for simultaneous major failures of all the various major systems (gas/lights/line etc.) you'd rapidly realize you can't carry enough crapola and actually dive.
The reality is that equipment rarely fails and when it does its actually fairly easy to share and/or manage with a competent buddy or 2. Brain failures on technical dives are much more insidious and difficult to handle.
Great point, that well maintained and properly assembled gear rarely fails. I have noticed that myself as well.
I agree that having 1 or 2 buddies that you could mouch off of makes life underwater easier, but as a general rule I try to plan to be buddy independent. Different philosophy.