You speak like an engineer who has all the answers on how to ascend a set of stairs without having realised the people you’re designing for use wheels.
I am likely to be travelling alone and anyhow, my Mother is dead. But I would like to hear your advice on bringing a landline on vacation to a foreign country.
You seem to be suggesting that I have to phone someone - on some other phone while in a foreign country - a trusted someone, to get the code that makes everything so secure in this loverly system. If that’s the case, why can’t I just call Apple and have them verify me? There’s secure and then there’s usable.