Assume you must evacuate your house during a wartime situation. You don't have any cash, but it's been depreciated owing to previous occurrences.
You, on the other hand, have your phone, hardware wallet, and seeds. You're in a nice mood.
The internet and cellphone networks then fall down.
How do you intend to use your bitcoin? Is it completely worthless?
You leave your house, the bank did not work and you have just a worthless cash in your hand, but the major portion of your saving is in bitcoin.
Even if there is no internet at your location, you can move to another country and still live because you will get internet in other places. Having bitcoin is useful but first thing is that you must save your life from this war situation.