PCIe 4.0 NMVE m.2

Now with the advent of HYPER speed PCIe 4.0 NMVE m.2 drives such as the Samsung 980 Pro etc, that are cable of almost double the throughpout of PCIe 3.0 NMVE m.2 drives, does it still make sense to have a physcally seperate SSDs for scratch and cache in LR Classic?  

If so, why?

Thanks,