Lift indicates 6 people capacity, yet only 4 people fit in it

Most lifts are mentioning how many people the lift can accomodate at a time.
In some lifts, it is mentioned that 6 people, 408 kg is the capacity of the lift.
In reality only 4 people can be accomodated in the lift at a time.
If the persons are fat or are carrying bags, luggage with them, the number of people who can use the lift at a time will be further reduced