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?
The MSI motherboard I use has 3, and with the PCIe expansion card installed, I have 7 m.2's. There are some expansion cards with 8 m.2 slots.
You can also get SATA to m.2 devices, or my fav is USB-c drives that hold 2 m.2.
Getting great speeds from that little device.