When I was an aircraft maintenance instructor in the USAF, we had Air Force Academy aerospace engineering students go though my classes. I'd make them do some of the hard stuff such as one accumulator which had to be serviced with the left hand on one side of the aircraft. I hope that they remembered that lesson.
I also impressed on my mechanical engineer daughter that unless it never breaks, you need to make sure that it can be easily fixed. She's working on a project right now that if the mechanics would lubricate a part and keep it clean as the owners manual says, it shouldn't wear out. However no one seems to do that and the part is extremely difficult and and expensive to replace. She's trying to make it more idiot proof (good luck with that) and/or easier to replace. She designs farming equipment.