Here I see the list of Genres with id numbers: https://developers.themoviedb.org/3/genres/get-movie-list

(1) So for example, looking at the snippet below, I wanted to know why the genre id numbers are random, why not make the genre id's number follow an order like 1,2,3,4,5 etc. why make random numbers? ... I am learning so I am trying to understand why its like this.

{
  "genres": [
    {
      "id": 28,
      "name": "Action"
    },
    {
      "id": 12,
      "name": "Adventure"
    },
    {
      "id": 16,
      "name": "Animation"
    },
    {
      "id": 35,
      "name": "Comedy"
    }, ...

(2) I know that I would use an API call like (https://api.themoviedb.org/3/movie/437557?api_key=KEY ) to get the details of one particular movie, and inside of that details object we have the genres of that one particular movie. So what situation would someone want to call just - https://api.themoviedb.org/3/genre/movie/list?api_key=KEY , and just get a list of the generic genres object we have above ?

Thank you for your help! :-)