For the exact reason you just said, instead of being very organised yourself. Its all done for you, just turn up and start. I personally wouldn't go down that route but i'm sure there are many that would or such courses wouldn't exist. I think as a rule they are better value than 'True integrated' but if your gonna go modular you might aswell sort it yourself, save money and get more hours or a TR. Dont want to get in to that debate though!
Phil