Originally Posted by Captain Avgas
Bundling wires gives them superior support, limits unwanted movement, takes stresses off connections, and greatly reduces the possibility of wires chaffing on the airframe.
To me, dangerous building is about poor workmanship leading to a significantly increased possibility of an adverse outcome. I think that's pretty much what I see in the photo posted by the OP.
I agree, wiring like what the OP posted negates any and all benefits of "strength in numbers" wire bundling. It may not be obviously dangerous but I will bet my next paycheck that you would see more failures with wiring like this than doing it properly. That being said, I'm not going to tell the OP to change his wiring, I have learned it is far too easy to make general statements on how to repair something on this forum if it's not your plane.