Harry Bloomfield wrote

I insure the car, because it is a legal requirement.

I do that too, but don't have any of the optional car insurance.

I insure the house because I could not afford to replace it.

I don't, because I can afford to replace it, and because it is very
unlikely that I would lose the entire house in any circumstances.

OTOH my neighbour just one house away managed to
lose their entire house when some loony decided that
it was infested with demons and put plastic bags full of
petrol inside the house and lit one outside the house.

She's apparently still at large.

I self insure everything else, including myself,

Yeah, I don't bother with health insurance either,
tho here, it does get you a quicker result with the
no life threatening medical issues like cataracts etc.

with the money I have saved in not paying for extra insurances
and extended warranties. I save a considerable amount by also
paying cash for everything I buy. Having spare cash available
also helps make everything much cheaper to buy. If I see a
genuine bargain, I can buy it there and then.

Me too. But I chose to borrow when building the house,
partly because I was interested in seeing if it could be
done, but also because I was earning a lot more on
that money speculating in the stock market than
I was paying in interest on the borrowing.