In reply to Rog Wilko:
> Because mistakes happen! I am another person who has once (once only, as far as I know) belayed a second on a belay loop. Since then I have had a rule that I always keep my belay plate on the big loop, and never take it off and store it on a gear loop.
FWIW, I would find that a right pain in the arse, having a crab and belay device dangling in front while climbing.
I take the view that some mistakes should never happen, and one of these is failing to use the harness belay loop (or rope tie-in loop) for crucial safety-chain stuff, so I don't personally see the need to insure against that by having rated gear loops. Gear loops are around to the side, not really anywhere near the belay loop, and they look and feel completely different, so to clip one of them by mistake is inexcusably careless. I wouldn't want to climb with anyone who considered that a real possibility. After all, there are various other weak points to which a belay device could (theoretically) be clipped. What next - super strong chalk bag belts/clips, trouser belts, knicker elastic?