I've seen a discussion going on in the social media about whether Tenkara is fly fishing or not. Specifically, this becomes an issue when one considers using a Tenkara rig in "Fly Fishing Only" regulated water.
|Look, flies! It must be fly|
fishing. From Tenkara USA
The second question is a legal question: Does Tenkara angling fit the legal definition of fly angling in a given jurisdiction? In Connecticut, it does not. Apparently it does not in Washington either. Legally, Tenkara is not fly angling, it is Tenkara angling.
If you chose to fish with a Tenkara kit, I'm not sure why you would have an expectation that you'd be able to use it on "Fly Fishing Only" regulated waters. It's not, legally, fly fishing. So, either get over it or change the regulation.
I would suggest the change to the regulation would not be to redefine fly angling but instead to remove the restriction to the waters altogether. Anglers unite!