In reply to Paul B:
both really good articles, thanks Paul.
Many of the crags I had in mind were mentioned in the Rock & Ice article.
I find the "where practical" approach of the BMC article a lot easier to understand.
Thankfully my experience of perma draws has only been on crags where I would view it as appropriate.
As for the worn metal pictures, well the worst I ever saw was on the tape side of a biner, the biner had rotated and the tape was covering a horrendous gouge. Definitely worth carrying a few draws with you even when theres in situ gear so your not forced to clip it. That and one of those slim bike repair style tools for undoing maillons so you can strip dangerous gear.