why the word “insurance” the in the phrase“various kinds of insurance，” does not appear with plural form
why the word “insurance” in the phrase“various kinds of insurance” does not appear with plural form？

Question

why the word “insurance” the in the phrase“various  kinds of  insurance，” does not  appear with  plural form
why the word “insurance” in the phrase“various kinds of insurance” does not appear with plural form？

Answer

Simply because it's uncountable.
"Policy" as "a written statement of a contract of insurance" is countable. "Insurance" is not.
Other similar words: "building vs architecture", "statue vs sculpture" etc.

Answer

I agree with José