So the 8:00 cutoff is a corporate thing, not management spinning the random wheel. UPS is pushing their "on time network guarantee", and so are pushing drivers to get in earlier so that the various operations down the line can get wrapped/get started earlier. For those wondering, "how do they expect us to get back sooner when preload still doesn't wrap on time", that is the purpose of getting in earlier for everyone, to try and get loads to their destinations sooner to get their cars on the road on time.
Seeing as how for a long time it seemed many centers (as reported on this board) couldn't even care about the 9.5 metric, I wonder how long before this is moved on from.