I started noticing these issues in our store after they started implementing modernization as well, our store has even gotten at least one bad google review about it. I'm a softlines TM so I don't know too much about hardlines, but autofills used to get pulled and pushed every day for softlines, because of hours cut that doesn't happen anymore.
Also, since regular TMs started pushing truck they don't know what to do with product that hasn't been set yet and sometimes just put it anywhere to avoid backstocking it, so when something is set, the person setting it doesn't know where it is and it leaves empty spaces on the POG. Also, with so many people backstocking now and doing it incorrectly stuff can sit in the backroom unlocated, I've noticed a lot of 0 on the floor, 0 in back (3 on hand) an ETL said that usually means it's unlocated in the backroom, I used to very rarely see things come up like that on the mydevice.