[sanderjd]

I do tend to agree with you, but just to note that both the approaches you listed for this are more recent than the decisions rust made on this. It's not "good approaches to modular runtimes were already rock solid, why didn't they consider them?". It's "people have done promising work on this in the last decade, maybe rust could figure out how to incorporate it in some way moving forward".

[klabb3]

Oh for sure. Armchair pointing in hindsight is trivial, or at least easy. The folks who fleshed this out at such an early stage did an extremely impressive job.