Madam Speaker, I taught labour relations for many years and final position arbitration never struck me as a means of resolving anything, as a substitute for bargaining, even after one party has made use of its position of strength. I think it is a bit of an illusion, because if this mechanism does not really provide a means of resolving problems and is only the unsatisfactory conclusion of an aborted bargaining process, then the problem will not be resolved.
The problem will manifest itself in another way, legally or not. I understand that this is intellectually satisfying. They say: "We are sure that there will not be a strike because, at the end of the process, we will make the workers choose between the employer's offer and the union's offer". Except that one can think of many situations where this does not resolve the problem. Then you would have a conflict that would not be orderly, a conflict that would explode and would not be subject to the rules set out.
In the end, final position arbitration is an attempt to prevent a strike or a lockout. If this approach were as successful as it is supposed to be or as you claim it is, it would have quickly become widespread, which is not the case. If there were a solution, I would love to know what it is, but there is not.