Because, if some step failed, another step should work. For example, I had notification of water leakage, but my mother changed Mobile phone device. So, first notification was broken, but also was broken five more notifications on another phones. It was very sad 
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Yes, I need same, but not for scripts, I need for automations
Same 1:1 there.
the script sequence is also used in the automation actions sequence.
The action part follows the script syntax which can be used to interact with anything via services or events.
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