It can be used as client/server communication locally. I’ve done that (without pipexec) for bots in a multiplayer game. That way I could implement the bot ai independently and test them against each other.
I did pretty much this exact same thing too. The game runner spawns 2 bots and acts as the middleman/, piping their output to each other. I did it in node though. I wouldn't want to code this in bash.
