Well paid professional native Arabs and foreign experts because it’s a notoriously dangerous and sabotage prone industry?

You’re talking about an industry where you can throw a water bottle into a chemical vat and kill everyone in the building or loosen a valve and set an oil rig on fire lmao.

Slaves under the kafala system are used in domestic duties, construction, and service (or “service”) jobs. Not jobs that require significant trust and knowledge.

You need well treated wage slaves that think they’re free for those.