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Emojis are great when you want to convey tone or emotion that you normally can't do through text alone. I find them especially useful when a sentence as-is sounds a lot colder than you actually mean it to be
Obviously not the intention of OP and it's definitely excessive IMO but I do also find that they can be useful markers for longer texts. It gets a lot of hate but I find emojis really useful in codebase READMEs since you can quickly scan through and pick out the bits if information you're looking for