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I invite you to share your climbing grievances/bugaboos. I'll start:
-(obviously) belay badges at the crag
-chalk bag on a biner from the haul loop (or worse, a gear loop)
-belaying with munter technique (braking forward) while using an ATC - you see a lot of old heads doing this, i guess it's just habit but it's silly to do your brake hand slide in the forward position when the device brakes downward, in case your climber falls while you're sliding your hand. You would have to quickly react to brake then if they fell, but if instead you did the slide in downward position or alternated hands in downward position then you're already braking.
-using a prusik on a static line as edge protection - you wouldn't hang off a single prusik without a backup - instead I'd use a clove hitch on a locker , or an abd, or an atc with a third hand. I just treat the edge as a solo belay.