I have no issue with them re-organizing the truck, but wait until they are on the clock. Immediately after the PCM, they should organize their air and/or their first couple bulk stops. After their air is delivered, they should take the time to organize the rest. If the truck is so bulked out after PCM that they can’t do this, that’s UPS’s problem.
The only time UPS fixes anything, is when it regularly cost them money. That’s the only time even consider making a change.
As long as drivers are willing to re-organize the trucks off the clock, there is no reason for UPS to care about load quality. They are getting it loaded faster, and they are getting it organized for free.