When I read the title "Adeptus Mechanicus Forge World" I imagine a planet like Necromunda or Mars. Planet with no animal or plant life. With poison atmosphere or little atmosphere at all, with acid rains etc... Primary because
AM produce a LOT of vehicles ( especially Gryphonne IV witch was one of 2 Forge Worlds in the galaxy with schematics for rare Vanquisher tank... ). And when I saw the picture of the planet I saw Earth like planet with LOTS of plants and even oceans...
Seems like
GW writers and painters forgot the effect of thousands of years of industry that is 1000x bigger than an today Earth one can do wonders to nature of that world... No wonder it attracted the Tyranids, I would like to eat that pretty planet to if it was a burger or a nice juicy stake
And would the Nids even care about buildings, factories and such?
If not, why don't the
AM send a team to rebuild and restart the factories? Sure they would be intact if Nids don't have any interest in them.
And I imagine that most of the Forge World population woudl be Tech priests, Skitarii and Servitors...
Would Nids even be interested in such low biomass? ( well, they don't have that much flesh left in them )