Even if it has a similar design, that doesn't mean it's the same. The Containment Module is made of a material that adapts to powers, which is why it can contain superhuman beings like Inhumans. The Retreat is made of a highly durable vibranium alloy, which is why it can withstand attacks from Hulk. They aren't made of the same thing.
From my understanding, the Containment Module doesn't restrain its prisoners because of its durability but because it adapts to its prisoners' powers. Its durability could be lower than the Retreat's, but its ability to adapt to powers makes up for it
I mean what evidence do we have it's less durable then the retreat? Wy would S.H.I.E.L.D use inferior tech compared to stuff they've had since 2012 canonically speaking? Why would the module be so ineffective at adapting to Reyes' powers if it wasn't unprecedented? Why would Coulson be so shocked? It's pretty clear imo this feat is meant to put Robbie right up there
The only thing about its durability that was stated is that it's bulletproof. Whether it has a lower durability level compared to the Retreat or not doesn't mean it's inferior tech, and superior tech doesn't necessarily mean something is more durable. The module doesn't contain prisoners because of its durability: it contains them by adapting to their powers. They were shocked because it didn't adapt to Ghost Rider's powers and thus contain him inside.
I mean it kinda does, If I have tech that fails to adapt to weaker heroes then other models then I have an inferior product. Even with the adaptation in mind, we have no reason for it to be worse at adapting then the others in the actual text
There is still no reason to scale the Containment Module to the Retreat. One is made of a material that specifically adapts to powers, while the other is made of a material that can withstand powers purely because it is super durable.
