Credit cards --- bona fide, revolving-credit credit cards --- are so completely avoidable in modern life that I'm a little mystified as to why people get them at all. I couldn't for most of my adult life (weak credit score) and feel like I've dodged a bullet. I have a (secured) card with a low limit now, just to rent cars, but it's gotten a lot easier to rent cars with debit cards now, too.
Heading off a routine objection to this observation: I've had a family with kids since I was 22, and spent most of the years prior to the Matasano acquisition living, if not paycheck-to-paycheck, at least pretty close to it.
I'll add: I don't know what my credit score is now --- it's probably better than it was, since I've had that dumb car-renting card for 6+ years --- but, knowing that my credit was bad enough that I couldn't get a non-secured card, including from my own bank after the wires for the Matasano acquisition cleared, and knowing that I had at the time a house and a car and all that stuff, and really no trouble ever getting a lease for any place I could afford the rent for, I find myself wondering a lot how much credit scores actually matter. If I'd thought that when I was 22, I'd say, "welp, I just don't have enough life experience to know". But I'm 42 now, and I have a bit of a hard time projecting to a point where I can see a clear reason to give a shit what number Equifax generates for me. Like, maybe I'll care a lot when I'm 62? I kind of doubt it, though.