Update in accordance with WG discussion

Clarify that only components which substantially determine performance need be reproducible, and that the whole stack should be accompanied by usable instructions.

submission_rules.adoc

@@ -780,7 +780,7 @@ Examples and counterexamples:
 
 A research, development, or internal (RDI) component  does not meet the requirements for an available or preview component. An RDI system is a system containing one or more RDI components. RDI hardware components may not be submitted as _Available_ components  until the submission cycle after next or 221 days whichever is longer.
 
-RDI systems using only Available hardware must use a _Reproducible_ software stack.  A _Reproducible_ software stack consists only of _Available_ components and _Reproducible_ binary components. A binary component is _Reproducible_ if it is downloadable and installable by the submission deadline from a URL by anyone to whom the hardware is Available, which must remain valid until a release of the software is Available.  The binary must be accompanied with instructions to allow a reasonable expert user to install it on a hardware system similar to the submission system.
+RDI systems using only Available hardware must use a _Reproducible_ software stack, accompanied by instructions which would allow a reasonable expert user to download and install it on a hardware system similar to the submission system. A software stack is _Reproducible_ if all components that substantially determine performance are either _Available_ or _Reproducible_. A binary component is _Reproducible_ if it is downloadable by anyone to whom the hardware is Available, from a URL which must remain valid until a release of the software is Available. 
 
 
 ## After publication