Where I can see it failing is for people who live "outside" the system - I have a friend who refuses to uses banks and deals only in cash and ancient coins - he can't find an above-the-board place to live because of his lack of credit score. But with that said, he does have a high risk of not being able to make rent on time, so its difficult to say what the policy should be.
As for finding a job, I don't know of any instance where a poor credit score would prevent you from getting a job, other than getting a security clearance, but that also seems reasonable since the government wants to know if you have any blackmail-able "money troubles" that an enemy actor can take advantage of.