Middle class people who think of cooking for themselves as a hobby maybe lose the ability to understand labor-saving technical advances. People who cook as a duty think of cutting bread as more work, which it quite obviously is.

If cooking is a hobby for you, you're seeking labor. Maybe that makes the obvious unintelligible. If you're poor and have a bunch of hungry kids waiting, you don't want the cutting board covering up half your counter space while you're carefully trying not to screw up eight slices of bread before something on the stove burns.