> What problem does stdx actually solve?

Even a small rust programme can end up importing hundreds of crates. For many applications you need to investigate and verify your dependencies.

A substantialstandard library, the hypothesis is, will vastly reduce the number of sources you need to trust

It is early days for this, it is not to be trusted yet.

2. It is not crates.io specifically that is the problem. It is the concept of using many imports that all need verifying (my original statement here)