you may well need crossings with their myriad of descriptions. Has any one ever wondered about the nature of the fundamental structural concept associated with the meaning?
History has obvious example of conflicts associated with it. And assumably it history is not alone. If anything the protection of those crossing have been more important.
Theoretically speaking paradox’s seem to make good use of it.
Space has borders. What defines them?
In the amount of years knowledge has existed who has actually looked at real wormholes or is the natural science of looking just focused on the worm. Yet the “reality” of black holes must have some.
Black holes may not be straight but if they exist for travel you might go straight through them.
Some aspects of science do work with the concept they are focusing on genes.!