I would guess it’s been eaten by newer seismic design. A skilled framer can put nails in fast even with a regular hammer. Hammering enough nails to hold up the

I would guess it’s been eaten by newer seismic design. A skilled framer can put nails in fast even with a regular hammer. Hammering enough nails to hold up the house by hand may well take the same amount of time as nail gunning enough nails into a sheer wall to pass modern inspection. Also, framing is generally quite fast and accounts for very little of the labor involved in building a house.