I always assumed credit scores were an integral and historic part of the American financial system.
They were not, they are very recent，most of your parents didn’t have credit scores growing up, and as you can probably tell or at least intuit, it’s mostly just a b******* scheme for those with capital to accrue more capital by invading your privacy.
The calculation is opaque to both you and the banker but it is calculated the same way by the agency that does it.
If your credit application is rejected, they are required to show you the score and you’re entitled to free copies of your credit report data (historically you couldn’t see your data or had to pay for it). The banker can give generic advice on improving your score and point out things in your credit report them at look bad and suggest ways to finesse them, but the calculation and decision are mostly out of his hands. He doesn’t really know