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I would think that data centers would be using as much prefab / modular construction as possible and on-site work would be as limited as possible.

Those prefab factories may not exist though, and companies want to build out now before the market is mature, instead of a long-term play.

They likely are. However you still need someone to connect the wires to each prefab section.

might take a while I expect there's a lot of regulation around using a licensed electrician, that kind of thing needs more legislation to allow a robot to replace it, I am speculating

It's coming...

https://www.navigate.ai/