A local Amazon delivery driver was just found to have been taking the photos then swiping the package. The only reason he was caught was someones Ring doorbell. If anything the package photos are to help Amazon refute claims.
I don't know the pay structure for Amazon drivers, but I would not be surprised that we are giving up "trustworthy" drivers for the cheapest option Amazon can provide at scale. I've heard working at UPS as a driver is a great job long-term for some people perhaps leading to more integrity, but I'm just speculating. Maybe I'm wrong but I trust UPS or FedEx with my packages more than Amazon or their flex drivers.