Bitcoin is the dumbest thing ever invented.
If you think Bitcoin is dumb then why you're present on this forum? If you don't like the idea of Bitcoin and find it useless then I believe someone like you should not be part of the forum that's a place for Bitcoin community. You need some research I believe, no I think you may need some treatment so you can understand Bitcoin properly.
For me I think he is just a troll that needs people to actually notice him just like the other fella who always shares post about how he is the original Satoshi Nakamoto and the owner of the forum. Sometimes when I see post like this, ignoring them is probably the best thing but with that being said how can someone even think of uttering such nonsense that Bitcoin is the dumbest thing created, well it's simple if you like being a financial slave to the system then you are free to go but other who don't know the importance of BTC.
How is investing in something that people need being a slave, but investing in something no one needs being free? If I invest in dollars I hold something that masses of people need for paying off debt owed to banks. I am the master, not the slave. On the other hand, if you traded dollars for Bitcoin you are the slave because you need other people to invest and buy your Bitcoin otherwise you cannot get your dollars back. It's hilarious how you Bitcoin evangelists think that you're the masters while in reality you're the slaves.
Let me say that I appreciate your wisdom and insightfulness about words from the main OP and your subsequent replies. Many take the ideology of Bitcoin to the extreme even though it is not perfect and I think I am one of the few who tells some facts about it here since I've been in the world of investment before the crypto era, unlike many of them who's eyes are just being opened to investment due to cryptocurrency.
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!