I agree with you that keeping all your savings in bitcoin is very risky because of the volatility, I wouldn't do that either. But on the other hand, gold also has some disadvantages, if you have a large amount of gold, it will also be difficult to move. Like in the war between Russia and Ukraine or the earthquake in Turkey, if your assets are all gold, you won't have enough time to transfer them all, but with bitcoin, you absolutely can. Both are good and have pros and cons. I also prefer gold savings because it is stable and not as volatile as bitcoin in the short term.
If we are talking about cataclysms, as it recently happened in Turkey, then with great destruction, the seed phrase and the hardware wallet may also be lost, there are always risks, this must be taken into account. Or you need to create several copies of the seed phrases and store them in different places to prevent such an outcome.
If we are talking about gold, then no one will keep a large amount of gold at home, it is not convenient and dangerous. If it is stored in a bank vault, then you have at least some guarantees from the bank, although I don’t believe in them either.
You are probably right that you don"t need to invest everything in one thing, diversification will help you sleep more peacefully.