For e.g. the ferret rewiring experiments, tongue based vision, etc., is a plausible alternative hypothesis that there are more general subtypes of regions that aren't fully specialized but are more interoperable than others?

For example, (Playing devil's advocate here) I could phrase all of the mentioned experiments as "sensory input remapping" among "sensory input processing modules." Similarly, much of the work in BCI interfaces for e.g. controlling cursors or prosthetics could be called "motor control remapping". Have we ever observed cortex being rewired for drastically dissimilar purposes? For example, motor cortex receiving sensory input?

If we can't do stuff like that, then my assumption would be that at the very least, a lot of the initial configuration is prenatal and follows kind of a "script" that might be determined by either some genome-encoded fractal rule of tissue formation, or similarities in the general conditions present during gestation. Either way, I'm not yet convinced there's a strong argument that all brain function can be explained as working like a ULM (Even if a lot of it can)