More likely the drivers, something which has never been Dell's forte. Are you running a Dell-provided driver for the E6430, the latest Intel-provided driver, or one that comes from Windows Update?

The USB 3.0 controller in the (main body of the) E6430 is the exact same Intel chipset XHCI controller that comes in every single other Q77 chipset laptop, which is the vast majority of 2012-generation (Core i3/5/7-3xxx aka Ivy Bridge) major-brand business notebooks. It's essentially the same chipset controller as in every other Intel-CPU notebook of the same generation.

As for the lowest bidder, Dell moved their notebook manufacturing from Malaysia for the D-series (and older) to China for the E-series, and it REALLY showed in the early production E6x00 series. It's improved a lot since then, and the E6x30 generation was a big improvement over the past 3 (see, for example, the fit of the bottom case and HDD mounts over the E6x20).

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I still run a few old apps in a not-network-connected Windows XP VM. I used to occasionally open the network to let it get updates... no point anymore.