For simplicity and convenience, it’s great that animations locally replicate automatically. This would be a little challenge to implement manually.
A lot of people like to keep a tight ship about never trusting the client. Though the player has ownership of local character models, and any networkownership parts to their name; it seems more so giving them as little as possible.
For this particular instance, I ask why there’s little if any concern over a user screwing around with local animations, custom, or otherwise. If hitboxes are enabled they can do all sorts of physics things. Perhaps dislocating the head to camera through walls. But, no concern, still?