As someone whose really into science and technology I think the biggest proof of the failures of the terran accord is their level of technology.
As someone who is into technological development the accord should have been way more developed than it is in the story. I do not know if they could have defeated the affini but realistically they should have been able to hold out a lot longer than just 5 years.
with our current technological development we should no longer have any form of human soldier let alone human labourer and human life spans should be practically unlimited thanks to gene therapy and human augmentation.
for goodness sake we are studying anti matter at this very moment.
The only way this could have happened is if the terran accord was purposely suppressing technological development on behalf of special interests groups at detriment of both the general publics and their own personal development.
And the worst part of the whole situation is, I can absolutely see the real world governments pulling this exact bs.
thanks to various declassified documents it's pretty much been revealed that we should be roughly 20 to 50 years more advanced than we are now because certain special interests groups have been actively killing technological developments for the better part of a damn century.