Greetings,
Mr. 34. Well, if you insist...Yes, you still have to inspect and keep an eye on your wiring. For instance...A particular circuit may have been wired and terminated quite acceptably at the factory with proper size and construction of wire for
factory installed accessories BUT, subsequent owners
may have added to that particular circuit or installed replacement equipment that would tax the capacities of the wiring.
Most important IMO is tight, corrosion free connections including your grounds. I've experienced more than a few problems that have been traced to bad grounding.
As far as re-labeling...HAH! Labels are just a suggestion.