It's worth noting that the original author of the 10 essentials, Harvey Manning, advocated for a simple Boy Scout Knife. Fuller context, Manning was the editor of the first several issues of "Freedom of the Hills", which for many decades has been considered something of the American Bible of mountaineering technique. Mountaineering, almost by definition, happens above treeline where there is no wood, and thus heat for food, warmth for the body and shelter all need to be provided by what's in the climber's backpack; stove, warm when wet clothing, tent.
I think the one place where there is a real "need" for bigger blade in the backcountry are those places where you need something like a machete to cut back the brush to make forward progress. The other situation is when the expedition is long enough between resupplies to make carrying fuel too difficult in terms of weight and there is ample opportunity for sustainable wood harvesting. I actually use this approach on long backcountry skiing day trips where the only way to complete the drip during day light is to be fast and light as possible but there is a realistic possibility of being forced to bivy overnight, possibly with an injured partner. In those cases, carrying a knife, saw, wood stove and a tarp is lighter than carrying sleeping bags and a tent. Note, I don't advocate what I just described. I find it to be pushing the red line safety wise. I do it occasionally with people I trust but don't want anybody dying from trying it.
Getting back on point... I think this thread is more about the OP wanting a new modern folder like the Rat1 and I think he should just get it so that his curiosity is satisfied. 99% of the reason we carry knives in the woods is to make us happy and that's really enough.