Oh yes. Samsung 9100 Pro does 14800/13400 MiB/s over PCIe 5x4.

Maybe not, but the USB consortium hasn't got around to polluting the USB4 namespace yet so it's safer to buy stuff with the USB4 label.

Of course, just give them some time and they'll come up with USB4 "gen classic" at 11 Mbps.

Many PCIe4 or 5 drives