That's just direct dependencies. Including all the dependency tree is 785k LOC according to lib.rs. Most rust libraries include tons of others.
Does this take into account feature flags when summing LOC? It's common practice in Rust to really only use a subset of a dependency, controlled by compile-time flags.
For a given tool, I'd expect the Rust version to have even more deps than the JS version because code reuse is more important in a lower-level language. I get the argument that JS users are on average less competent than Rust users, but we're talking about authors who build serious tools/libs in the first place.
326 packages right now when doing a build. Seems large in general, but for a Rust project, not abnormal.
Takes what, maybe 15 seconds to compile on a high-core machine from scratch? Isn't the end of the world.
Worse is the scope to have to review all those things, if you'd like to use it for your main passwords, that'd be my biggest worry. Luckily most are well established already as far as I can tell.