People have a bad habit of saving files to the actual hard drive/ssd of their system and not network / cloud drives. (i.e. your desktop or somewhere on c:/)
Unless the drive is encrypted (and it's rarely done in O&G) - those drives could be physically pulled out, plugged into a new system, and the data retrieved. This is all outside of AD and other access being cut off.
That and it's just preferable not to have trusted devices floating around.
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