The test as worded should stand, since "we should include X in the standard because Y isn't allowed to use non-standard code" is a pretty weak argument.
Worse than weak, it is dangerous, because it is effectively a rhetorical device which can be used to avoid providing any substantive justification for standardization. It works because the WG21 rules have not stated explicitly that this not an acceptable reason.
In my opinion, corporations who can only use library components from an international standard, should come together and form their own Working Group under SC22, and develop their own separate draft for a "C++ Library Attachmenté."
They can put whatever they want in it. They can evolve it separately without being tied to WG21's work program. And then when anyone says "but I can only use standard library components" we can point them there and get on with our important work.
Best