Prisma uses rust for two main reasons from what I understand. 1) to keep the engine portable and maximize code reuse, to make projects like this Python adapter possible for example 2) under the hood Primsa does not use joins. It does a waterfall of queries (but not n+1), then stitches the data together in memory, which happens in the rust engine for performance reasons

Because Prisma Python currently interfaces with the Rust engine over HTTP (I am looking into changing this) and the Rust engines can be found here:

https://github.com/prisma/prisma-engines