I am that PO.
Maybe.
I have made quite a few mods to my jeeps, adding relays, changing wiring. I have used quality connectors, split loom, and well-dressed. To me, these mods make sense and are quite functional. But, without a conversation with me (and, possibly, good note-taking), you wouldn't know what any of this shit does.
It's like some schmuck that buys your jeep as a DD and mall crawler (but wants to look cool), then has a problem with the rearend, who then takes it to Les Schwab. Then Schwab doesn't know what they're looking at and the owner forgets that you told them about the Tru-Trac.
I have removed my fair share of rats nests from previous vehicles. Luckily, I have a background that, for the most part, allows me to figure it out.
But, I do try to have that conversation with the new buyer. Where it goes from there, who knows. In one ear and out the other, perhaps.