Earlier quoted context omitted.
What if that level of "too many packages" is the only way the driver could avoid getting a demerit for under performance? What if a livable wage is only possible if you quote more packages than is reasonable due to the intense pressure amazon has on the contract delivery market?
What if 80% of drivers don’t do this? Maybe the other 20% need to just get a different job if they aren’t able to avoid under performance without resorting to time saving tricks.
But I get your point - the issue, I think, is that under-performance in a job role should be a rarity. You should be hiring people that are likely going to comfortably exceed your minimum expectations and compensate them appropriately. If someone isn't a fit for a position it's most optimal for the company to never hire them (to avoid the cost of training and any capital costs associated with the new employee) but, barring that, it's optimal for both parties to break off the arrangement ASAP since the employer isn't getting the value they expect for their cost and the employee is going to be getting a whole lot of stress.
If it's the case where a significant portion of drivers are marked as underperforming then you're either 1) being dishonest about the job expectations in an effort to penalize decently efficient employees wrongfully or 2) presenting the position in a misleading or confused manner and not properly screening employees - either way it's on the employer, not the employee, if the issue is widespread.
It really seems like the issue with strict performance requirements in warehouses and with drivers is pretty widespread so I'd first look to attribute this to amazon rather than the folks they are hiring and, with assistance from inference along with lots of personal biases, I'm pretty certain Amazon is using artificially inflated performance targets as a way to minimize paid compensation while cycling through the glut of available labour knowing that, in a lot of states, being accepted to a position after submitting an offer and refusing it will result in a discontinuation of unemployment and a constant stream of applications is required to maintain unemployment checks.
A business can essentially hold you hostage with the US unemployment system by under-selling the actual job expectations and then using the threat of being fired with cause for performance reasons to complicate your chances of getting back on insurance.