Every emoji I saw in a terminal or Git commit message was worse than alternatives. This included emoji intended for information not fun. Color made them distracting when the wanted information was anything else. A monochrome font could not solve this because most emoji are too complex to display clearly at normal text sizes without color. They were cumbersome to grep. (Uncommon Unicode characters would have this problem also.) Many had unclear meanings.

Use emoji in your CLIs if you desire. But make them optional. Opt in ideally.