Your analysis of the rule is certainly valid. I considered not leaving that rule in and honestly only left that rule in as a "flavor" nod to Shogi. I figured that between the fact that you only have three pawns per player and many of them will end up mutated from being captured in the Arena, including or leaving that particular rule out wouldn't really make a huge difference in the gameplay. It could be interesting to play with your suggested rule change and see if that makes much of a difference or not over the course of a a series of games...
Your analysis of the rule is certainly valid. I considered not leaving that rule in and honestly only left that rule in as a "flavor" nod to Shogi. I figured that between the fact that you only have three pawns per player and many of them will end up mutated from being captured in the Arena, including or leaving that particular rule out wouldn't really make a huge difference in the gameplay. It could be interesting to play with your suggested rule change and see if that makes much of a difference or not over the course of a a series of games...