Comment by jandrewrogers

That was addressed circa C++17 IIRC, same with all of the technically UB surrounding DMA memory. You needed non-obvious incantations for some use cases but they were expressible. C++23 eliminated most of those incantations. Before all of this you had to use “blessed” incantations that were technically UB but which compilers needed to allow because the code was expressing a valid use case.

I find it crazy that popular systems languages didn’t have an explicitly valid way to deal with all of these ambiguous ownership and lifetime issues around memory until relatively recently.