the drawback is the same as with all the others NUMA solution, the whole thing (mmu, os, code, controllers etc) needs to be aware of where the data comes and go

the drawback is the same as with all the others NUMA solution, the whole thing (mmu, os, code, controllers etc) needs to be aware of where the data comes and go because moving something from one bank to another stalls the compute pipeline for a lot, which makes compilers and thread scheduling and pagination etc a complex affair.