It is for focus on your character being the leader of the group (supposedly). I think its effect largely depends on the particular animation of your character.

For example, the Female Miquote /joy motion when done after the fact, does make the character look a bit daft (imo).

On the other hand, when my Fem Roe doe her /joy motion after the fact, it makes her look like a confidant leader who celebrates only after a short moment of contemplation or self reflection.

The more quick and eccentric the reaction the worse it probably fits. The more subtle and stoic, the better it fits.