A few pieces of history here

1. The credit system didn't exist until around 1989.
2. Back then, your "trustworthiness" was vague. So if you were black in America walking into a bank, they can easily reject you. And they'd pass this information around like "So-and-so was rejected because he was black we at the Ku Klux bank believe he is untrustworthy" so now banks all over the US has that information and will auto reject you.
3. In 1970s, they push laws to deny credit based on gender, religion, race. You know, because women couldn't have bank accounts.

So, the credit system fixed a few problems.

Now, there's a few other issues. Credit score + education + zip code easily tells people more about you. Lots of data loopholes.

Im disgusted by the credit score system for the points you laid out. And it's a imperfect system that did solve some big problems.