Once again, one more “newbie” question, until you realize an account does not define the person behind it.

So, is
BTC really the ideal tool to replace banks in typical loans and mortgages, or is it only designed for big players and small-scale charity "loans" like we usually see in this forum?
IDEAL is a large word because not many will support the idea. Before you get Bitcoin to replace fiat, you need to remove/pass through government. I can cope with short term loans on Bitcoin, but for long term loans, i bet the price will never remain stable as of the time collected.
Practical example:
Loan as of 01/09/2025 to be paid in four years
0.001 BTC ~ 108 USD
Loan after four years, Bitcoin price hiked during this period(let's say X2) ie excluding interest for the four years interval
0.001 BTC ~ 216 as per (In this case the debtor is repaying high)
But if Bitcoin dips 0.001 BTC ~ somewhere around 87 USD (In this case the lender is at loss)
IMO, Bitcoin isn't fair/ideal for long term loans.