Any reason not to run the OEM trailer harness?

Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You

Trailer Tow Wiring Kit

My wiring harness doesn't match up at all, but Metra assures me

Product Description, Nilight Multi-Tow USCAR 7-Way Connector Replacement Harness, Plug type: USCAR, Length: 24 Inches, Material of Terminal

Nilight USCAR 7 Pin Trailer Wiring Harness Replacement Multi-Tow 7 Way Harness Connector 24 Inch Factory Tow Package Trailer Truck Plug Connector

RESOLVED -- OEM trailer wiring 4 way troubleshooting assistance

ORP trailer wiring harness issue? Running lights not working

Wiring for a Trailer

Any reason not to run the OEM trailer harness?