This tripped me up as well. While modern NAND SSDs do slow down to about a third of the advertised speeds on non-sequential reads/writes, that is still 2-3 GB/s

This tripped me up as well. While modern NAND SSDs do slow down to about a third of the advertised speeds on non-sequential reads/writes, that is still 2-3 GB/s. The "normal" (SATA) SSDs are just limited by SATA's link speed, they could easily get to similar rates.