The QD1 random write performance from Mushkin's Reactor 512GB is down compared to many other drives on our chart. This is an area where FortisFlash would really help. Even SanDisk's Ultra II with three-bit-per-cell flash is faster at low queue depths, even though TLC has higher write latency.
By QD2, the Reactor regains composure and outperforms the low-cost competition, going so far as to run with SanDisk's Extreme Pro 480GB. The recovery at QD2 appears to be part of an optimization effort to improve the user experience on SMI-controlled products.
Most users never push high queue depths. SSDs are so fast that it's nearly impossible to stack commands. Even if you're multitasking with several programs running, it's difficult to even hit QD8, since most applications hit the drive for a moment to get or write the data they need.
I guess because in some ways its so old school. (It saved money back then too.) Back in the "Home Computer" days card-edge connectors were used for expansion connections (on one side of the connection.) Retro consoles used it too with game carts. The PC used it then, and even still today, for expansion AND adding graphics. Back in the day Floppy drives, primarily 5.25" and larger used such a connection for data (and a molex for power.)
If that patent ever gets challenged, I dunno if it will hold-up because of all of that. In Modern storage though, the connector is, currently, unique though.