Should a hunter have to? No. But the hunter should be prepared to just because things happen.
You and a guide can be in BFE and he twists his ankle during the initial pack out. Weather sucks so no Super Cub coming to give you a replacement guide and/or packer. It is the hunter's choice to step it up to get everything to camp or risk letting another predator take the rack, cape, and/or meat.
Can be a desert bear and it is hot AF. Guide gets heat exhaustion, the hunter hikes to get cell coverage, calls the outfitter, and the outfitter tells you help is 4 hours out to your vehicle and how ever long from there to get to the guide and/or bear. Sucks that the hunter will likely lose the hide and meat due to not wanting to step up.
Best to step it up if required and see what the outfitter can do after the fact rather than throwing a fit in the woods about it not being the hunter's job.