Why no metal based radiant floor heat? Danger?

Why hasn't someone just welded rebar or something like this to a wood stove rather than using pex and water?
Would it get too hot and maybe dangerous?

If so, why not do a suspended system under the floor like they do with pex but with rebar welded together? Maybe still to hot?

Just thought I would ask. My house has a wood deck rather than a concrete slab so I was concerned about trying this. Thanks for any feedback.

Thanks for all the responses. In my mind if you attached the metal to the stove it would conduct the heat ok and would just take longer than hydro systems. After the responses I looked up the best metals for this. Turns out it's the same for electric. So copper and Aluminum would work. Aluminum rods are kinda cheap but I will prob stick with a standard system. Not sure it would work or work to well at the stove end. You could make a thing that rests and could be removed, to bridge across to the rods and the stove so it wouldn't get too hot but I would prob forget to remove it when it gets too hot. I was just curious so thanks again.