I still can find some full cut or rough cut lumber at the salvage store.
Water Works makes furniture with it, big demand for saw blade marked items.
Can get an extra board out of a log with the slimmer sizes than full cut I guess.
Walked through a home being built about 20 years ago. Interior studs were finger joint.

Got the tub installed and drain system tested yesterday. Got the backer board installed at end of tub, added Liquid Nail to the stubs before installing to hold backer board in place. Talked with skinny neighbor. Got sheetrock cut and fitted, no nails. Went to 3 granddaughter's soccer games last night. Stop at Buck's on the way to the house today.