I'm sure price had everything to do with it. One relay probably cost way more than the wire and a few connectors to run power to a switch and back.
I think my 2011 GMC uses servo motors to operated all the AC flaps, I assume a Pulse Width Modulator circuit in the computer to drive them. So three small wires to any location in the vehicle to operate the flaps and set them in any position you want. Sure there is a headlight relay too .. probably solid state, last for decades.
That Madelectrical has got some decent prices on those OEM style terminals.
Easy to lose sight sometimes how long ago these cars were built.
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