My buddy is a GM guy who is a service advisor in a busy automotive repair joint. His biggest complaint about Ford from a professional sense, disregarding his otherwise strong pro GM anti Ford opinions, is often they switched parts within the same model year, either requiring the tech completely disassemble and identify the part before ordering the right part, or ordering all the options of parts that could be required, then returning the parts that were not applicable to that specific model within that model year.
He also has been stymied when the part required was actually for a model year before or after. The vehicle owners get all upset when it adds days to the repair simply to get the correct part, and he has to hold his tongue and not berate Ford too vociferously.