It’s not health insurance, it’s sickness insurance.
I am insured so that if I am deemed unable to work through sickness I will receive 50% of my current salary until pensionable age.
I am insured so that I receive a lump sum if I suffer a critical illness (terminal cancer etc).
If I die while working for my current employer my estate receives 8 x my current salary.
I also have savings of 4 years of salary and a DC pension (only worth £300k so pitiful compared to DB) and these savings cover our outstanding mortgage.
My workplace provides free health insurance (all prior conditions covered too) for which I pay a monthly benefit in kind charge for that I’d not inconsiderable.
I spend money on these things because they are important to me. They give me peace of mind. I can afford it as I save in other areas. My car is over 10 years old. My hair is graying and I’m living with it. I had a haircut over 6 months ago. I’ve never used deliveroo or got a tattoo or my nails done or any other fripperies. These things don’t matter to me. I rarely buy new clothes. Financial security is all about priorities.