> That’s not stopping projects from working on it.

To support that...

Grin contains a phenomenal amount of cryptography: https://github.com/mimblewimble/grin

Bulletproofs implementation in rust (small proof sizes): https://github.com/dalek-cryptography/bulletproofs

...with tons of really well done cryptography by that group (dalek): https://github.com/dalek-cryptography

Pairing based crypto library used in the second largest distribution of Ethereum (and maybe zcash?): https://github.com/paritytech/bn

These libraries have prompted me to start learning rust (albeit slowly as I'm using Go and C at work).