Functionally, a credit card would work exactly like your debit card or cash, except you would also be reaping all the benefits of credit cards and improved credit scores.
But overall, I agree with your point about cost-benefit analysis and impulse control being difficult to overcome.
> I often wonder how people on the verge of eviction think about this kind of thing — whether it is salient or even understandable
My answer is that people in those situations think about these things very differently than people who have never encountered them. Or, flip it -- if dings on your credit score are the worst speedbump that society has thrown in your path, you probably don't have the skills necessary to live broke.
I didn't come for financial advice, but thanks
The preceeding is a statement about most of my life. I've gotten better at such stuff and my lifestyle has changed after grad school -- and since I didn't have credit cards while living below the poverty line and generally being a schlub, I didn't fuck up my credit, so a few months of having a credit card as a de facto adult earned me a near-perfect credit score when I needed it.