For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
I think that simply having a shit load of boards saves a lot of time. The human pick and place.... Or as Louis calls it "Monkey see, Monkey do".
Looking at the correct values on the schem and then looking through a book of SMT components to find that value and package is looong.