No advantages whatsoever. It used to be cheaper but not anymore, since nobody does it.
Wooden foundations gradually rot from the moisture in the soil, unless they are built from cedar, which is highly unlikely (and almost impossible to check, really, unless you expose it). Pressure treated wood was/is also used but not sure if it was available in 1985.
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"An idea is always a generalization, and generalization is a property of thinking. To generalize means to think." Georg Hegel
“To generalize is to be an idiot.” William Blake
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