[mywittyname]

Wood also requires heavy equipment to cut, mill, process. Not to mention, it needs a heck of a lot of land area. In addition to whatever process is involved in "hardening" this wood.

Plus, steel is entirely recyclable. And it has some natural properties that make is relatively easy to recycle. It can be sorted with magnets, and it has a higher melting point than most impurities.

[djrogers]

The big advantage to wood though, is that while it's growing it's a carbon sink, and once hardened that carbon is likely stored forever.

[korantu]

you can achieve the same effect by making plastic with captured co2 [1]. Carbon would stay in plastic for very long time.

This way you get to reuse all the (enormous) existing infrastructure, as well.

[1] https://www.mdpi.com/2227-9717/9/5/759/pdf