I had a few years of young and dumb followed by struggling through the great recession that pretty well wrecked my credit early on.

I then went through a few years while rebuilding where I really dug into learning how the credit system works and gaming it to my advantage. It was literally a case of getting entertainment out of "number goes up." I got bored with it once my available lines of credit hit a couple multiples of my annual income, but the end result was having a basically perfect credit score.

It ultimately paid off when it came time to buy a car and get a mortgage. Basically had immediate access to the absolute best rates available and approvals have always gone super smooth.

The flip side of that is my SO who never went through the young and dumb stage and hadn't needed to rebuild credit, but had a similar "fuck credit" attitude as the OP so they'd never had credit in the first place. The fortunate thing there is we were able to jump start their credit history by adding them as an authorized user on one of my older accounts with a high line of credit -- this gave a massive boost to both average account age and available credit and pretty much instantly brought their score up from the 5-600s to low 700s. Add in a few more deliberate things like financing a car instead of paying cash and now they've got enough of a credit profile built up that it'll be okay if anything ever happens to me.

Obviously, that requires a lot of trust, but it's good info for relationships where one partner has established credit and the other doesn't.