It truly depends. Fiat game is debt game. If you know how to manage debt in your favor, this can be a great advantage towards buying Bitcoin.
I am assuming you’re talking normal people deeply in debt. Normal people that don’t understand anything about fiat. In that case, you’re 100% right.
I’ll give you a good real life example.
Let’s say you get 500k in debt with a fixed interest of 2% a year using your company. You have a company, and a good cash flow. You also have accounting strategies and have a team for handling taxes and writeoffs. That 500k can be paid in 15 years, for example, something you would have to pay 3k monthly for it. With that 500k you can buy roughly 5BTC. Assuming an average of 10% increase per year on the bircoin price, by the end of the 15 year your BTC would be worth 2 million (500 + (1 + 0.1)^15).
In one hand you have 675k to be paid by the 15 years loan you did with the initial 500k.
In other hand you have 2 million worth of an asset. The trick then becomes make sure you can pay that loan, right? There are dark ways you can around with it.
If you consider the inflation the game is even more interesting. Now, if you consider real inflation M2 of European Union, that would be, on average around 5% a year. The 500k you loan now will transform into 674k, but if you check the value of this money in inflation terms, that 674k will be worth around 325k in today’s money.