I don’t think Roblox moderates animations at all because some animations use custom rigs and unless you have the exact rig, it’s nearly impossible to know what the animation actually would look like.
Anything that isn’t a default R6 or R15 rig is practically useless to moderate if you can’t even recreate the rig.
That being said, playing animations that are stored in the game itself would actually be a massive upgrade because animations sometimes fail to load if loaded from the website which is problematic for scripts that specifically depend on a animation keyframe or time stamp.
OH another cool thing!
Playing animation keyframe sequences would also allow for modifying animations in real-time.
You could use a script that automatically generates variations and randomized animations per-character if you wanted.
Could make your own blending system and everything which would actually be extremely useful too and is currently not possible with uploaded animations.