There is, now, a separate problem where 2x4s specifically are made of very inferior lumber. most will have either pith or wane, and I've seen them have both, which means the tree they harvested is maybe 5 inches in diameter and they might have gotten 3 2x4s out of one log. Even compared to when I was in carpentry class in high school the quality of construction lumber has decreased. Larger boards like 2x8s or 2x12s don't similarly suffer because it's impossible to make them out of saplings. But still.