OK so what about the borrower? It's still an irrational decision.

If BTC is going to beat fiat (because it will remain forever more volatile), it will always be better to take loans in the cheaper depreciating asset.

Not to mention, in the example nostr: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  mentions the purchase of a car, which is a liability, not an asset, and even less a yield-bearing asset (unless you're telling me that you use it for work or something and so on, but that's splitting hairs)