I'm out of date here, but in my days this was often AFS and stuff. But again: What's the threat model for LUKS, here? A student has their stuff on that exact s

I'm out of date here, but in my days this was often AFS and stuff. But again: What's the threat model for LUKS, here? A student has their stuff on that exact shared machine in the computer lab, and somehow local root attacks only work when attacker is alone on the machine?