Having the Baneling Nest be a separate building also forces you to use a precious Drone, which means you need to use a precious Larva. In effect, it costs you more. Which is entirely appropriate for a Tier 1 building. You're making a hard choice with early-game Larva.
By the time you're wanting to make Lurkers or Brood Lords, Larva are easy(ier) to come by, so it isn't much of a cost. Better to just make it happen by itself.
Why? This isn't a lore issue; it's a gameplay issue.Perhaps, as a compromise, the Nest remains as it is in multiplayer (if it is indeed an issue of balance), but in the campaign, it mutates from the Pool.




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