It's my understanding that venting through the soffit isn't a great idea either. I believe the soffit tends to draw in outside air so if you vent your humid bathroom air out the soffit it just gets drawn back into your attic. I've had direct experience with this on our house in Indiana. The sheathing inside the attic directly above the soffit vent showed signs of mold so I had the vent re-routed through the roof.
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