The recent scaling update partially fixed a bug that allowed a player to use full body tracking while in a seat/station through reloading the avatar. It's currently still possible through entering and exiting the afk animation, but it's still a bug and may get fixed in the future.
It was useful for better positioning your avatar in vehicles and seats on avatars or to use more dynamic poses than what the station offers by default. It's a rather niche usecase but allows for some neat creative moments.
It would be nice to have this as an option that contextually appears in the quick action menu for fbt users who are in a station which disables the station animation for the user when activated.
Edit: added a picture as an example. It's not a really good example but it wouldn't have been possible to reposition and pose for that pucture without the fbt station bug as it was taken mid-flight where a seat is needed to be attached to the aircraft.

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