>>It doesn’t matter if it is a treaty or a trade agreement.
There is a method of dispute resolution and that is an arbitration panel and the each nation’s judiciary must enforce the arbitration panel’s judgement(s).<<
Doesn’t the question of “treaty or trade agreement” determine how hard it is to change or break and how it compares to laws?
But, I assume any treaty or trade agreement can be broken or withdrawn from. But, a bilateral treaty doesn't have a third party to resolve disputes.
The thing about these FTAs is that they are really Investor-State Trade agreements. And as they have proliferated and disputes have been settled, they have estabished a body of law, or precedents.
The is quite a bit of internet info on Investor-State Law and Investor-State Trade agreements.