Is bagging your own stuff really that much more work? The sacrifice is waiting in line for them to fuck up bagging it anyways. It’s significantly faster to use self and get home sooner to relax. If you’re over filling a cart I’m sure it makes sense to go to an actually cashier but outside of that it’s just wasting time
It’s works most of them time unless you’re in a specialty trade making spindle, gears, and such that must be threaded backwards to avoid the wheel undoing itself.