Never mind comparing bleeding edge NVMe with (by now) decade-old DDR3, while the current bleeding edge DDR5 is now trickling out at 100GB/s+ pretty easily.

Never mind DDR memory latencies of ~50ns, vs NVMe at 50uS+.

Just because the user doesn't notice GUI problems doesn't mean it's not going to be a catastrophic bottleneck in any memory-intensive application.