Having two competing systems in parallel maybe isn’t the best choice. People probably don’t want to click 2 buttons everytime. And then you lose their votes. Also this way the emojis are mere decoration and not something useful to grade the posts.
I read some people don’t like the way down-voting works. A new system would be a good opportunity to fix this and provide ways to distinguish between disapproval and wanting to lower visibility.
Idk. If it’s a well-made, elaborate new system. I’m okay to replace the old one.
I think some Fediverse software already has emoji reactions. Could be Misskey or Pleroma or something like that.