Samsung makes fast expensive storage but even cheap storage can max out SATA, hence there's no point Samsung trying to compete in the dwindling SATA space.
Does this mean that we'll start to see SATA replaced with faster interfaces in the future? Something like U.2/U.3 that's currently available to the enterprise?
My desktop motherboard has 4... not sure how many you need, even if 8tb drives are pretty pricey. Though actual PCIe lanes in consumer CPUs are limited. If you bump up to ThreadRipper, you can use PCIe to M.2 adapters to add lots of drives.