In reply to subtle:
> Someone else then queried a lot of the list, including the socks - why would you need to carry spare socks, the route is all on dry rock, no bogs/marshes to cross and also, when have you ever stopped, mid walk, changed socks and carried on?
Having generally very warm feet, I appreciate when I do remember to bring spare socks, and can change mid-walk into a nice fresh fluffy pair. This is most often of value to me on very hot days. It's probably a sign of a larger problem that I have the wrong kinds of socks and/or footwear, but that's a whole other question.
Historically, I have taken the same view as yourself; that it's not necessary to have a spare pair on dry trips. Having more recently got into the habit of being able to change socks on long hot days in the hills, it's something I quite look forwards to now.
Waterproof trousers top my personal list of an often-recommended item which I almost never use. I own a pair which I now use solely for satisfying mandatory kit requirements for some races. They (various pairs) have travelled far and wide, through all kinds of wild conditions over decades, 99% of the time in the rucksack.
The 1% when I have put them on it's been because: 'Oh well, it's going to rain quite heavily, I've lugged these here, may as well use them'. I was always then less comfortable with them on than I was before, so gradually used them less and less. The vast majority of time I now just don't bring them at all on trips. I do use them anywhere where I'm going to be standing around for ages in the rain (marshalling etc.). For being caught out by accident or injury I have a bivi bag. I'd be much more hesitant to leave without that than the despised waterproof trousers.