True. This are some noteworthy points. During war, if the country is facing serious financial crisis, they can snatch away everything you own. After all, it is the government who owns all your property. But, since bitcoin and other crypto currencies are decentralized, they can not take your points at their own will or power. Again, this is a global currency with no boundary restriction. Hence, you can take it with you to somewhere else without any issue and use it (unless that country specifically banned crypto currencies).
Cryptocurrency are now a good option of storing your extra wealth.
Though I'm not saying here that invest all your savings in crypto but rather diversify your holdings.
You can manage your crypto (i.e. bitcoin) without the interference of other third parties.
So the OP has valid point on his statement, no matter what, you alone can dictate what's gonna happen with your bitcoin holdings.