Probably more complex to have that duct and connection in the steering column. One more thing to disconnect and deal with in the process of manufacturing and in repair work.
But the main reason is modern AC/heat. It’s just so good, if you seal the car you can bring the temp down quickly, old cars could not, so they’d duct some AC (or just air) right into your body to help. You are still sweating in the hot car, but the extra air is helpful. Modern cars you can run like a fridge lol.
Also, heated/cooled seats also make that extra duct needless.
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