Yea I get that side of it also. Its basically testing PING + DNS, http. To test the internet is “fully” working not just a network ping.
From my side in IT, We have had DNS servers go down, which doesn’t really mean the network is down and to restart everything which is why we usually only test IP pings. That being said i’m sure the CERBO uses a lot of DNS to work right, so probably need that working also.