Thanks for the point of view on the East Coast. I grew up there but have not run any rivers there for 50 years. I have used canoes as gear haulers for kayaks.
I’ve only done the Green in the West amd aside from seeing self supporting rafts all the canoes and kayakers were self contained
i felt bad for the kayakers who had the toilet right in back of them
Toilets may be the tipping factor No one really likes having them in their boat. In the East its not necessary inland to have one
On salt water we use PVC pipe with wag bags
You can float the Green in an inner tube.
It has no rapids.
Along most of the Maine Island Trail it is carry in and carry out - absolutely everything. But it is still contained within the one kayak or canoe. One argument for the full length sea kayak is that you can pack to keep all results further away from the cockpit for the trip home.