Samsung is actually having trouble meeting their own internal demand for components. IIRC, they were even getting memory from arch-rival Hynix at some point this year. Having Apple dial back might not be such a bad thing for Samsung if it helps sort out their internal supply chain.
Samsung has long sourced externally for parts. Despite being (one of?) the worlds biggest LCD panel vendors many of their TVs had non-Samsung panels in them at least a few years ago. It was particularly the mid-low ranges.
