Halacha’s intervention in mourning for the dead

Hello, Michi.
What is the logic in the fact that the halakha determines the form of mourning and how much one should mourn for one’s father and mother and goes so far as to forbid them for an entire year? What is the religious goal they are trying to achieve here? As if there is spiritual value in mourning like in putting on tefillin, for example? As I understand it, mourning is an emotion that everyone experiences in their own way, what is the meaning of the intervention here?