Not so easy to implement this the right way I guess. For local emergencies the German app solution seems to work adequately, but for big emergencies the cell broadcast should definitely be an option.
But I see your point, a system like that should be used in a reasonable manner.
Edit: and by „not foreseen to be used“ I mean that Germany can’t, because we don’t have the required technical infrastructure.
Are you sure about this? While the NINA App did provide me with weather warnings as well as (possibly pinned) warning about the Coronavirus, I have no information about the delay with which those messages were provided to me. It could well have been a delay of over half an hour or more, without me noticing it.
Yesterday I decided to uninstall the NINA App, since it showed me that it doesn't work. It had all the permissions necessary to pop up a message and to notify my with a sound, yet it didn't do anything.
And it looks like the delay yesterday was actually caused by the bavarians (http://blog.fefe.de/?ts=a1a4ef27). But that something like this is even possible in this system is ridiculous of course -.-