Good point. I stand corrected: the bit on the screwdriver should be the weakest point.
One major problem is the warning “do not over-tighten screws” is kind of useless without some definition of “over-tighten”, and a way to measure it. If they specified the correct torque (and provided a precision torque-driver) that would work, but it would change the cost of the free screwdriver from $1.50 to $100, so that’s not gonna happen. Because without a torque driver, the only way to actually know you’ve over tightened it is when something breaks, which is too late.