Well ... those kind of agreements are used often as vehicles to bypass national sovereignty. Lets say that official X wants to make law Y, that has a slim chanc

Well ... those kind of agreements are used often as vehicles to bypass national sovereignty. Lets say that official X wants to make law Y, that has a slim chance of passing trough the national legislative body or public. But if it signs an agreement that have these provisions, than the country has to change its laws to fulfill the treaty. Due to reasons US Congress can vote only binary on approving the agreement. Take it as is or throw it all away. In other places it is similar. So there are internal politics to consider.