9800x3d was close to the bottom bin
What? Where's that coming from?
X3D parts need massively lower power to stay cool enough even under meh-ish cooling solutions, and iirc L3/VCache runs at the clock of the fastest core, so they limited PT and turbo clocks vs. the vanilla models.
Pretty sure that in terms of low leakage, the 5800X3D, 7800X3D and 9800X3D are better bins than most 5700X, 7700X and 9700X, respectively.
The 9850X3D has to be a better bin of course; it can probably just hit higher clocks at the same voltages, but like adroc said, they had 1.5 years of yield improvements and to accumulate top-bin chips for this SKU.