-snip-
Even if he invests in bitcoin, there is no guarantee that it will save him if the seed phrase is stored in physical form and kept at the site of a natural disaster. As you said, natural disasters are unpredictable and devastating, and Bitcoin is not the god that can save us from them if we store it in physical.
Nothing is absolutely safe, everything has risks and Bitcoin is no exception, even has greater risks. Because online threats are more unpredictable and dangerous.
I completely agree with you - nothing is truly safe in this world and what we assume today as security measures are simply ways to minimize risks as much as possible. Bitcoin, which has so far been declared safe, also has the potential to become unsafe if one or a certain entity controls more than 50% of the Bitcoin network hash rate. I think this is a real threat, although I believe it is very difficult
[super difficult] for any entity or group to control that much of the network. The fact is - nothing is impossible, not now but there is no guarantee it will never be.
Therefore - it is important to prepare yourself and plan your investment to a more wise level. Don't invest all your money in one asset - diversify into assets that have the potential to give returns. It doesn't have to be all in crypto - but some physical assets still seem very worthy of consideration if they really want to diversify.