Well, we could argue than having everyone in the same building is also a risk (traffic/weather issues could block all operators to come for example).

So having operators dispatched in several towns with probably multiple Internet providers could reduce this risk. In case of real big crisis, I agree it’s better to have everyone at voice reach, in the same room.

But, while a global internet outage could be a real risk for operators at home, having everybody able to join from everywhere can mitigate that.

And in case of a global internet disruption (another big risk that could happen), well classic mobile users would have also issues to contact 911 as lot of 4G/5G towers use internet instead of internally owned network to transmit our calls and data (the old copper landline disappear more and more).

Note that I agree with yours points too, their is pro and cons everywhere :-)