no Doubt — metal tool for flat planing of wood — all sorts of planers, jointer, etc. — has its advantages: does not warp from moisture easy to work with, reliable. However, even if it is lighter than wood, to work harder: more friction. And the dent can leave on the treated surface with a careless motion, and a sharp edge strogaya glands harder to expose, it is not visible to the eye on a metal surface background of the slide plane.
But there is a way to avoid these shortcomings. Stick to the sole of the tool the thin layer of wood, e.g. a veneer or a veneer of hardwood. Glue use 88 or BF-2; on top of the veneer, put a hot iron to heat and pressure.