Have you ever said to a batter "you have 6 balls left!", then they change their mode and just slog?
The damage that this does is immeasurable.
Any progress from the session is diluted or reduced. The batting shapes and thought processes evaporate.
Arguments ensue about whether it was 4, 6 or caught at deep mid on
The batter starts the next opportunity to bat with this poor experience running through their veins.
It's one of my biggest bug bears, and for years I have been trying to figure out a way around this.