Automation for switch toggle, ensure all lights are same state

Configuration
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11

I stumbled across that post that gives 2 smart approaches on how to deal with mixed-states bulbs

I need to try the Proportional toggle one! :exploding_head:
…
Done. Here is my working example with 3 lights :ok_hand:

description: Toggle sofa lights and TV light proportionally
trigger:
  - platform: event
    event_type: deconz_event
    event_data:
      id: aqara_switch_living_room
      unique_id: 54:ef:44:10:00:5b:6f:c3
      event: 2002
      device_id: 27a83c2f0c73aeda8ba26ef3cb6937a5
condition: []
action:
  - variables:
      count_on: >
        {{ expand(state_attr('light.sofa_tv', 'entity_id')) |
        selectattr('state','eq', 'on') | list | count }}
      count_off: >
        {{ expand(state_attr('light.sofa_tv', 'entity_id')) |
        selectattr('state','eq', 'off') | list | count }}
      light_action: "{{ iif( count_on >= count_off, 'off', 'on' ) }}"
  - service: light.turn_{{ light_action }}
    metadata: {}
    data: {}
    target:
      entity_id: light.sofa_tv
mode: single