Cross Training
There is always value in understanding a little better what you use, if nothing else the pilot could probably better explain a problem after his course.
I left aviation and went into computer hardware. We had some software guys on a hardware coursefor that very reason. It took them 35 minutes to find the fuse missing on the fault finding section but it did not mean they could not write programs and at least they had a better understanding of what they were doing.
One of my pilots rebuilt his MG Magnette and apart from the respray did it all himself and probably to a better standard than most.