My understanding is that there are (a) minor personality issues like neuroses, for which therapy is sometimes useful and sometimes useless and (b) major orga

My understanding is that there are (a) minor personality issues like neuroses, for which therapy is sometimes useful and sometimes useless and (b) major organic mental illnesses like schizophrenia, for which therapy is almost entirely useless. In that light, asking "he's got schizotypal personality... should I advise therapy?" is much like asking "he's got schizotypal personality... should I advise a trip to Montana?"