Think of it the other way round. What advantage will you obtain with an MCC certificate earned on a 737? After all, you won't have a Type Rating, just a piece of paper saying you can read a checklist. The same goes for the JOC stuff. Do you really need it? To the best of my knowledge, most employers have now unloaded all financial liability for training onto their new employees. They appear to prefer employees with deep pockets rather than any particular skill set.