DSM and other such systems(icd for example) are for CLINICAL use. I.e. they are not academic. If 2 different mechanisms create the same symptoms and are treated

DSM and other such systems(icd for example) are for CLINICAL use. I.e. they are not academic. If 2 different mechanisms create the same symptoms and are treated by the same drugs then from a clinical aide of view separating them is pointless. Academic research on the mechanics of diseases is much more nuanced than what an article on a news site can cover. Once something is clearly separated as 2 different entities in a clinically meaningful way via research then the classification system will be updated. What this means is that if e.g. we find a way to differentiate between 2 different mechanisms for schizophrenia with each of the responding better to a different drug( even if those are already existing drugs, it gives us a shortcut to choosing the right medication without trial and error) then DSM will split schizophrenia to schizo due to x and schizo due to y with further guidelines for medication. Or split them into 2 different things entirely.