AMD had already done that with their 3D V-Cache, and to your point of SRAM & Logic not scaling on the same process they have also been working on that with the

AMD had already done that with their 3D V-Cache, and to your point of SRAM & Logic not scaling on the same process they have also been working on that with the just released RDNA3 GPUs (The I/O-die is 7nm and the Logic die is 5nm IIRC).