Backlash isn’t as big of an issue because it’s vertical and the weight of the router/spindle keep it at the bottom of the thread I guess you could say.
You still have axial cutting forces, much like a up-cut end mill can pull your stock up, a down-cut could push the spindle up (especially plunging/ramping in). Backlash in the x+y axis can cause unintentional movement on climb cutting, I’d imagine z-axis could too. Basically trade-offs with cost, as Rob mentioned, they are using a anti-backlash nut, however that is a wear (consumable) item as well.
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