Use case:

1. Send an alert 'if trigger name matches xyz and time is between x and y and' stop executing other actions
2. Send all other alerts (Default)

Currently, I have to add to the Default 'and trigger name DOES NOT match xyz' to not receive an alert.

Imagine it like Apache or Nginx rewrite rules:

    rewrite ^(/download/.*)/media/(\w+)\.?.*$ $1/mp3/$2.mp3 last;
    rewrite ^(/download/.*)/audio/(\w+)\.?.*$ $1/mp3/$2.ra  last;

where 'last' means stop processing other rules if a match found

Or mail filtering/rules in a Mail client like Outlook. Where in ordered rules you set Conditions, Actions and have an option "Stop processing more rules"
https://support.office.com/client/results?NS=OLWAO365B&ShowNav=true&Version=16&omkt=en-US&helpid=ms.exch.owab.InboxRulesStopProcessing