You disable the VPN, they show “unprotected”, come on, I’m not really unprotected, why such a dramatic word, I just disabled the thing a little, I’m “disconnected” but it doesn’t mean I’m actually unprotected, the same way it doesn’t mean I’m actually protected if I’m using a VPN.
The only problem I see with public wifi is the peer-to-peer nature of it. You no longer have the protection of a gateway if somebody is trying to be nefarious. They won’t sniff https traffic, but might attempt to connect to open services like an unsecured listener for the cat feeder.
In that instance, locking down the internet connection with a VPN would prevent an attack.