To quote from the REI site:

"This checklist is deliberately comprehensive and intended for trips in the backcountry where being self-sufficient is important to your well-being. Backpacking planning requires you to balance keeping pack weight low with ensuring you have the essentials you need for your particular trip."

I would be careful about depending too much upon the "group." Some groups are very cohesive and work together well in an emergency and others are just an accumulation of various individuals.

I have seen a fair number of SAR operations triggered when a person is separated from the group, more or less equipped and informed. Andthen the fun begins....

Do have a reason for wht you drap along, but just because the FAK or climbing gear didn't get used on that trip doesn't mean necessarily that it should be left behind. Some things, when you need them, you really need them