The memory model always had segmented memory in mind and safe C approaches are not new. The provenance model makes this more precise, but the need for this was

The memory model always had segmented memory in mind and safe C approaches are not new. The provenance model makes this more precise, but the need for this was to deal with corner cases such as pointer-to-integer roundtrips or access to the representation bytes of a pointer. Of course, neither GCC nor clang get this right, to the extend that those compiler are internally inconsistent and miscompile even code that did not any clarification to be considered correct.