Still need clean room for humans that needed to operate it. If have completely automated it, then don’t need clean room on Earth. The vacuum chamber is cheaper than the laser. Both reasons are saving millions at the expense of billions.

Fabs are probably the worst factories to put in space because of how much human adjustment they require. Also, the equipment is expensive and delicate, and redesigning it to work in space would be enormously expensive. It would be ruinous to lose one. They require tons of chemicals to work, that have to come from Earth, and produce a lot of nasty waste, which still have to dispose of in space.