Part of it is about skills. Part of it is about things like making questionable connections between what is actually mathematically shown in the model, and what

Part of it is about skills. Part of it is about things like making questionable connections between what is actually mathematically shown in the model, and what is claimed in terms of real-world relationships. Of course this is much easier to do when they don't clearly define how exactly real-world objects translate into the model :)