So you have 14 monsters, and you have to decide their actions in advance. How is that. It 2-3 minutes of players chatting amongst themselves?That's actually the ad&d 2nd edition example of play in the player's handbook, the wizard who realizes fireball will be a bad call and changes her mind. The dm warns her to make a call or lose her turn.
I'm not seeing delay for the reasons in the original post and most rounds players dont need to say anything, just roll their dice as not every round needs advanced planning. Honesty, so I dont have to verify their choices, helps save time. As a dm, I'm slowing up the game anytime I choose monster actions. Here, all of us decide at once, so players dont wait as long on me.
(I’m genuinely curious; my experience of such systems - 1E D&D was such a system, and there’s a reason 3E, 4E, and 5E moved away from it).