> They seem to think it's bunk tech support mumbo jumbo

It indeed is. It's a way of coping with systems that are fundamentally illegible and unpredictable. If you have full rights over your machine and you're not running extremely shoddy software, you should never have to reboot your computer to make an issue go away. And rebooting your computer often guarantees that you'll never actually understand whatever issue is plaguing you.

Encouraging people to reboot their computers is promoting a fundamentally superstitious mode of engagement with machines that are generally reliable and predictable, instead of approaching them in terms of cause and effect. At best, it's the tired point-and-click sysadmin's workaround for not knowing what their system is doing.

Maybe for overwhelmed IT departments running half-baked operating systems loaded to the gills with invasive and meddlesome corporate spyware suites so inherently complex and complicated in their interactions with each other that the system itself is rendered more or less incomprehensible (even to the people administering it), just asking users to reboot is the right play to write in the tech support playbook. Maybe it's got the right ROI for a geek reluctantly roped into giving free tech support for a relative. But it's absolutely mumbo-jumbo and a sign that the "troubleshooter" is probably either ill-equipped to understand what's going on or just not interested.