Where can templates be used?

1

I would like to use templates as threshold values, when a temperature falls below a value (using "below: " condition). Doesn’t work.

I found this in the documentation, where a template is used straight in a "delay: " value.

The question is: why can’t use templates for the “below:” numeric condition, but the below sample shows it can be used with “delay:” ?

automation:
 - alias: turn something off after x time after turning it on
   trigger:
     platform: state
     entity_id: switch.something
     to: 'on'
   action:
     **- delay: '00:{{ states('input_number.minutes') | int }}:{{ states('input_number.seconds') | int }}'**
     - service: switch.turn_off
       entity_id: switch.something

automation:
 - alias: turn something off after x time after turning it on
   trigger:
     platform: state
     entity_id: switch.something
     to: 'on'
   action:
     - delay: '00:{{ states('input_number.minutes') | int }}:{{ states('input_number.seconds') | int }}'
     - service: switch.turn_off
       entity_id: switch.something