argument_specs missing for this role and others

[EmptyByte]

As per:
https://docs.ansible.com/projects/ansible/latest/playbook_guide/playbooks_reuse_roles.html#role-argument-validation

The role lacks argument validation. It would be nice if this was included ?

argument_specs:
  main:
    short_description: Main entry point for the Postfix role
    options:
      postfix_conf:
        type: dict
        default: {}
        description: >-
          This is a dictionary which can hold key/value pairs of all supported
          Postfix configuration parameters. Keys not supported by the installed
          Postfix are ignored. The default is empty {}.
        options:
          previous:
            type: str
            choices: ['replaced']

      postfix_files:
        type: list
        elements: dict
        default: []
        description: >-
          This is a list of files that will be placed in /etc/postfix and that
          can be converted into Postfix Lookup Tables if needed.
        options:
          name:
            type: str
            required: true
          content:
            type: str
            required: true
          postmap:
            type: bool
            default: false

      postfix_check:
        type: bool
        default: true
        description: >-
          This is a boolean which determines if postfix check is run before
          starting Postfix if the configuration has changed. The default is true.

      postfix_backup:
        type: bool
        default: false
        description: >-
          This is a boolean which determines if the role will make a single
          backup copy of the configuration - for example, cp /etc/postfix/main.cf
          /etc/postfix/main.cf.backup, thus overwriting the previous backup, if any.
          The default is false. NOTE: If you want to set this to true, you must also
          set postfix_backup_multiple: false - see below.

      postfix_backup_multiple:
        type: bool
        default: true
        description: >-
          This is a boolean which determines if the role will make a timestamped
          backup copy of the configuration - for example, cp /etc/postfix/main.cf
          /etc/postfix/main.cf.$(date -Isec), thus keeping multiple backup copies.
          The default is true. NOTE: This setting overrides postfix_backup, so you
          must set this to false if you want to use postfix_backup.

      postfix_manage_firewall:
        type: bool
        default: false
        description: >-
          Boolean flag allowing to configure firewall using the firewall role.
          Manage the smtp related ports, 25/tcp, 465/tcp, and 587/tcp. If the
          variable is set to false, the postfix role does not manage the firewall.
          Default to false.

      postfix_manage_selinux:
        type: bool
        default: false
        description: >-
          Boolean flag allowing to configure selinux using the selinux role.
          Assign smtp_port_t to the smtp related ports. If the variable is set to
          false, the postfix role does not manage the selinux.