I believe what it means is that we no longer need to use “service_template” or “data_template” where they used to be required for HA to parse templates. Now just use the regular “service” and “data” options like you would without templates.
so instead of:
action:
service_template: >
{% if........%}
light.turn_on
{% else %}
light.turn_off
{% endif %}
data_template:
entity_id: >
{% if....%}
light.one
{% else %}
light.two
{% endif %}
you can now just use:
action:
service: >
{% if........%}
light.turn_on
{% else %}
light.turn_off
{% endif %}
data:
entity_id: >
{% if....%}
light.one
{% else %}
light.two
{% endif %}
At least that’s how I understand it.