exactly, it would be a catastrophe. so many industries would grind to a halt without their trained laborers, and even if you did somehow manage to backfill all those with documented workers (yeah right), the cost to do so would be insane for less skilled, less efficient workers. the inflation would make post-covid look insignificant by comparison.
No, the ban last year is the case that presented “serious, difficult and new legal issues”. This ruling is just restoring things to the way they were for decades.