Certainly interesting about the FAA. I am confident they have data to back it up.
My guess is the huge number and type of connections has something to do with the issues the typical mechanic has with crimping. Crimps for one and two wire connections the different wire gauges and the list go on. Might have thousands of $ into all the proper tools just for crimping wiring.
I thought I had some excellent crimps and found out different when I had to de pin them. A couple pulled out while I was pulling on the wire. Too tight is bad as is too loose. I am sure an A&P has taken a required class on crimping.
Also glad my C10 isn't an airplane!
I wish the connectors and tools were standardized.