Good question. My personal take is that C++ makes many developers happy, comfortable, and you can develop in C++ using different approaches, that is enough. There is no programming language for all and I think this is why we have a lot of them now and even DSLs.

I consider myself far from what is considered professional C++ knowledge, but for cryptography I always relied on Crypto++ [1] and that made me decide for the use of C++, at least partially. I think we can apply the same thinking for JavaScript or TypeScript, personally I don't like too much those programming languages but if I need to write a RESTful backend I go that route because they have good modules for that or sometimes I decide for Python.

[1] https://www.cryptopp.com/