Emotes with multiple joints animations look awful, they ruin the Minecraft feel and remind of the cringe YouTube Minecraft animations like this:
{% embed url="https://www.youtube.com/watch?v=_zpodmZW65E" %}
The current emotes have the same style of Bedrock edition emotes, which follows the Mojang style guidelines.
{% embed url="https://minecraft.fandom.com/wiki/Emotes" %}
Adding more joins would require a complete rewrite of the animations code which would take weeks of coding.