Rust ABI (as opposed to C ABI) dynamic libraries are incredibly fragile with regard to compiler/build environment changes. Trying to actually swap them out between separate builds is pretty much unsupported. So most of the benefits of dynamic libraries (sharing code between different builds, updating an individual dependency) are not achieved.

They’re only really useful if you’re distributing multiple binary executables that share most of the underlying code, and you want to save some disk space in the final install. The standard Rust toolchain builds use them for this purpose last time I checked.

the rust abi is explicitly unstable. there are community projects to bring dynamic linking, but it's mostly not worth it.

RAM is cheap mmmkay?

Or at least it used to be when they designed the thing…