Most laws are little more than temporary opinions. If a law doesn't give you the outcome you wanted, you can always change it. Or you can choose to not enforce it when it would be against your interests.
I believe the point is that it's often impossible to build a factory without sending your experts on site to supervise it. And sometimes you need to send people on a short notice, if something unexpected happens or if the people assigned to that site are not available. Then the people will go in with whatever visas are available on such a short notice, hoping that it's not in the destination country's interests to stop them.
This is fundamentally not about immigration or laws but whether you want to make your country an attractive place to invest in.
I believe the point is that it's often impossible to build a factory without sending your experts on site to supervise it. And sometimes you need to send people on a short notice, if something unexpected happens or if the people assigned to that site are not available. Then the people will go in with whatever visas are available on such a short notice, hoping that it's not in the destination country's interests to stop them.
This is fundamentally not about immigration or laws but whether you want to make your country an attractive place to invest in.