It is good that we enjoy these benefits, as they compensate in some way for the low salary we earn. I have confirmed from other members who describe this, from other countries where it is not an obligation, and even employers who do not motivate staff with them.
It is something important what you describe, certainly there is no stipulated amount to grant the bonus, that is why it can be an addition, as you express it. With 5% or 10% on the salary at some point, it is motivating for the employees.