It's What The Ranger Likes!
Ultimately, it's what the ranger at the put-in likes and does not matter if you or I like it!
Years back, I saw a ranger deny a buddy river access, because the ranger had never seen my buddies new state of the art $300 crapper (non-bag system). The ranger never budged on the grounds that he was unfamiliar with the new system, even after proving it did not leak filled full of water. This denied crapper is now one of the preferred choices by this very same river and park service.
First, you need to go through the pain in the ass hassle of researching all of the rivers in the near and far future you'll float and see what they allow and don't allow. You'll probably find that you're only left with a couple choices.
I've thought about creating a spread sheet sometime of all the groovers, bags, and can options and having all of the rivers that are Groover Patrolled checked off per what is allowed.