I care about my finances. But I don't worry about them. I have a high degree of certainty that, barring getting a disease that prevents me from working for multiple years, I won't have major financial problems for the rest of my life. The fact that I live in a country with good public healthcare (Spain) is a factor here.
>? could you handle, say, your house burning overnight with all your belongings ?
100% yes. My belongings are worth less than $10k. It would be annoying, but completely manageable.