When looking at the Collect Inventory policies it was noticed that under the "Advanced" options, the default for "Collect Delta Hardware Inventory" shows some dataclasses under the "Software" category (and other categories) that seem not Hardware related:
ITMS 8.x
For example, "Collect Software Inventory" is about installed applications and files only:
"Collect Hardware Inventory" is about hardware (models, serial numbers, devices, etc) and hardware-related software and options (firmware, Drivers, Operating System and its settings, Users):