I already mentioned that some well paying jobs (the kind that people stuck in debt traps would most benefit from) require an active credit score to obtain. So “not using credit” is not an option. As well, credit is a primary way that the people who hold generational wealth got that wealth. Oh, and they run the system.
You’ve created a straw “poor person” and insist on shadow boxing it. If you ever decide to confront the complex systems that these fellow humans face, I encourage you to read up on the modern credit system. Wikipedia has a good rundown with active sources.