In reply to ripper:
> Well I'm not a disliker but struggling a bit to see what's so dangerous about being taken off belay while clipped to the lower-off. So long as the belayer puts me back on and takes in tight before I unclip... Happy to be told how I'm dicing with death by doing this?
Imagine the lower off is two independent bolts with rings on them. A fairly common scenario.
You get to the anchor and clip in directly with a couple linked quickdraws (what most experienced sport climbers do), or a lanyard. You are now only attached to a single bolt, sure it is not likely to fail, but these things do occasionally happen. If you are still on belay at the point, and the bolt failed you'd just fall to the last bolt. If you're not being belayed at all, you'd fall to the ground.
Effectively you're belayed to just one bolt, which I can't imagine is something you'd do in a multi pitch situation.
Besides, why would you get your belayer to take you off when they're going to put you back on straight away anyway? It's much safer for the belayer just to pay out an arm full of rope.
Rethreading at a lower off is pretty high consequence if you get it wrong. It's good to have a solid system and check and re check.
Post edited at 20:18