"Versatility" is really two things and should be removed

[nikomatsakis]

As I think about it, I think that versatility are really two distinct things:

• Able to access every low-level capability. I think this is covered reasonably well by transparent, though it's mildly distinct to say that costs are visible and that they are controllable.
• Able to write reasonably high-level code if you want to. I think this is covered by productive.

[djc]

Hmm, it feels to me like versatility is a thing by itself, because of network effects? That is, it's valuable both for people and organizations and also for projects to use fewer languages, and if Rust does a good job at all of

• Server processes that need to scale up to large amounts of concurrency
• Embedded contexts (in particular WebAssembly)
• Scripting

then that increases its value somewhat independently of transparency or productivity.