Well, ChaCha is actually a hash function. Specifically it was a candidate for SHA3 but was beaten by Keccak in the final spec. Additionally, aes-ctr-128 has the same performance as ChaCha (1.5 GB/s).

All I was trying to illustrate was that in general, pairing a PRNG with a block cipher or hash function is sufficient to create a CSPRNG, and any developers worried about their PRNGs can couple rand() with a readily available cipher/hash in the system libraries. After all the blog is explicit about not requiring a cryptographically secure RNG for most applications.