Good point regarding the items you mentioned. The unsalvageable materials I had in mind for new construction or renovations were things like siding, sheathing, wallboard, roofing, etc. And it’s probably not worth dealing with the lumber given the existing cuts and nailing. That said, the materials may be suitable for charities. And the materials could also be hauled away without cost to the builder.
If you knew how many nails I have pulled out of boards, my dad used to sell houses built with all used lumber, and used bricks, he even used antique adobe that he would take from very old adobe houses, the very large adobe, unlike the modern ones, in a personal house for himself he used old insulation out of old railroad refrigeration cars, used lumber, and antique adobe.