But from the main OP, your narration was not without faults but I still say that I give you 85%, you are indeed a thinker. Well, you might be wondering why the denial of the remaining 15%, it's because (though risky) whether physical or virtual, anything could be related and referred to as an asset. All the things that are being labelled assets today are because of the importance/relevance people place on them, and whether virtual or not, once people appreciate it to the point of investing and holding their money in it, they are assets and valuable, which is also applicable to Bitcoin in this context.
That said, Bitcoin as an asset can do almost everything that fiat money can do as well, all you need to do is to convert it one way or the other and the debt, loan, and mortgage as you cited them in the main OP will all be paid. Obligations can be fulfilled with Bitcoin, for real! About the bonds and other collateralized arrangements/agreements, what is happening in the crypto space is not any different, only that it is not so popular in governance and since many centralised systems have nothing to do with cryptocurrency but fiats, the popularity of such arrangements/agreements, and dependency in such can't be as though you are dealing with the fiat currencies like the USD.
Lastly, I give you 100% in this current OP, and my reason is simple, I 100% agree with you (in summary) that the fiat can do without Bitcoin but Bitcoin can't do without fiat which makes the fiat the master regardless of whatever anyone interprets to it. I've always indicated this even as some always preach Bitcoin as the supreme of them all. Let's be realistic!
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Even Investopedia called Bitcoin an asset among other renowned business, trading and investment websites/outlets. There is no controversy here as Bitcoin is a virtual/digital asset, this is unless you do not even know what asset means. Fine, Bitcoin might be guilty of some of what you narrated in the main OP, but certainly, it's an asset. If it is not an asset, why are people buying and holding it? Don't you know that anything you invest your money in is an asset?
For short, an asset is a store of value and Bitcoin perfectly fits into that fact/narration without mincing words. For it to be a "digital" asset doesn't make it less of an asset. The world is revolving and it's high time you accept this easy fact.