No it doesn't. We're defining the arrows here. Sure, we'll keep left-to-right to avoid confusing them, but as long as the usage of the arrows is consistent the

No it doesn't. We're defining the arrows here. Sure, we'll keep left-to-right to avoid confusing them, but as long as the usage of the arrows is consistent the message would still be correct if it was right-to-left. That's the entire point of defining the arrows using entropy.