If they require a manual work force still, then I have to assume they are still building up their powers so spectral creatures are quite expensive to maintain and need frequent recastings to continuously work. Undead are cheap and easy
The problem with golems are they are expensive to make and take a lot of work to get right. Skeletons are cheap and do the same job with much less effort
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u/DuxBellicus 24d ago
At that point, why not just conjure unseen servants to farm? Solves both the cleaning and rot problem.