For public contributions on Open Source projects I would say ❌, but I've used emojis in my personal projects and with a team, and we like it a lot, I think it creates a "happy environment", there's not just text, we have emojis that represents pre-defined things, so ✅.
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For public contributions on Open Source projects I would say ❌, but I've used emojis in my personal projects and with a team, and we like it a lot, I think it creates a "happy environment", there's not just text, we have emojis that represents pre-defined things, so ✅.