If you get scared over a little broken wires, then you should think about avoiding anything and everything as nothing is fail proof. There are other reasons to consider a different rev of Dmax than the injector harness issue...
The LLY has an injector harness issue. It can rub through at the alternator bracket or injectors #2 and or #7 connector can get bad and need the ice pick treatment. The injectors, like anything else mechanical, can fail, but it is not as common and you can fix them one at a time.
I make sure to move the mirrors in and out quite often. I try not to keep them in the same position very long and have had no issues. I live on a gravel road, so they do get pretty dirty.
What does it mean to stick and block the EGR?
The stick is made by a guy who goes by the name of "Fingers" who made a circuit to make the computer think that the EGR is working with proper flow when it is blocked. Blocked means that you have put a metal plate before the EGR to keep the gasses...