FICO scores (versus VantageScore) are used in 90% of credit decisions. FICO is used in mortgages, which is precisely what I care about my credit score for. I’m not marginal for an auto loan.
Most of the time I don’t worry about my credit score. Pay bills on time and for the most part most people will be fine. But credit scores do matter for the big stuff, and when the score is marginal it can make the difference between approval and denial for rewards credit cards.