"Memory" might not even be a concept in the C standard, rather it is what C programmers think about in practice. The culture around the language is that the language should get out of the way as much as possible while still providing a good amount of convenience, portability, and performance. The standard is a necessity, but is not the center of attention while working.

But then there's the memcpy escape hatch that lets you treat anything and everything as a raw sequence of bytes with no concern for types or aliasing. So arguably the fundamental memory model is still "just memory" (albeit not necessarily a single address space), and the rest is bolted on top and applies only to specific language constructs.