It’s like a fire drill. You have a protocol but how do you know it works? Small scale tests can work, like state-wide and local. But there are a lot of systems that interact that might cause issues. For example, as shown in https://youtu.be/Rsp_N83_AzE (iirc… I watched this earlier in the week) and https://www.theguardian.com/society/2023/apr/23/uk-emergency-alert-test-three-looking-into-why-users-failed-to-get-text the UK system failed. In the video there’s also one where the audio alerts played over and echoed, resulting in the message not coming across.
Back to the fire drill. You can easily tell if evacuating one room works, or one floor works, but evacuating a whole building at once might cause a jam at the stairwell. You want to know if that’s an issue without a fire, so you can fix the plan before the fire.
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