The reason the mini & studio work as well as they do for the use cases that have made them popular again is because the architecture puts memory, cpu, and gpu/npu on the same die, and puts storage right next to it, which is why you get the storage & memory bandwidth you do. The separability of those components would break that, which is why the Mac Pro didn’t survive past one generation in the Apple Silicon era.

The ram is not on the same "die" it's in the same package