There's so much i don't know.
What size works for point wood?
Maybe i was burning it as recently as a couple years ago.
(only done Merry's & FS but thinking of learning short splice to use up snakewood scraps )
Structural metal studs & (sheet steel) joists have been available for almost as long as i've been in the construction trades.
Certainly worked on projects in the early 80's that included them in some areas. Not much residential though, as you point out.
I think the idea is that metal is more predictable - you can use all of it, not variable loads/quality. The installer does not have to pay a lot of attention to sighting, defecting, sorting for appropriateness of location, as with solid lumber products. No going back and cutting/wedging long studs that bowed too much as they dried out, before the drywallers come through. Toenailing jacks and studs sideways to attain straightness at door/window openings, etc. Easier to move same quantity bundle of metal around a jobsite. Overall, probably saves a lot of labor.
MarinoWARE is a high quality manufacturer of cold-formed structural framing accessories like Web Stiffener, Flat Strap, Utility Angle. Click here to learn more.
www.marinoware.com
www.clarkdietrich.com
I've mostly used the drywall level stuff, often required by code or by the board in rehabs of apartments (Co-ops/condos) for presumed firecode.
Can't remember if it was cheaper per stick, but certain it ends up cheaper installed - until you try to hang big trim or heavy cabinets on it. Prep for that requires more labor, and....wood runners or plywood behind the drywall. Or special systems. IIRC, structural studs will hold screws pretty well, though.
The questions that go back & forth relate more to insulation, and fire issues.
There is some evidence that wood is better for both.
Then there is evidence (& sales) for ways to design around that.
Funny thing is that the green lobby is pushing tall wooden buildings these days.
With torrefied lumber, it is why in some areas, a lot more low-rise apts & light commercial seem to be wood framed again, and often wood clad.
Provides carbon capture & green insulation qualities or so it is posited. (Not against it personally, just have not paid attention/studied the issues.) We'll soon see how that initiative stands up to current market conditions.
smt