So that you don't accidentally run malware. MacOS is not iOS, you can run unsigned code if you really want to, but it will make you jump through a few hoops.
Full stop. I still talk to people every working day who don't realize that rebooting a computer is actually a real troubleshooting step. They seem to think it's bunk tech support mumbo jumbo rather than a genuinely useful step. It's 2026 and they're still surprised when that works.
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.
About two weeks ago, some Adobe Acrobat update introduced a hang that results in “Acrobat won’t open.” Open Task Manager and there’s four to eight stuck processes. Kill them and it works again most of the time, but once in ten it simply doesn’t recover.
Adobe acknowledged the issue to someone on my team. There’s no need for me to understand further; telling the user that a reboot will solve it is prudent advice. It’s on Adobe to fix it. You made assumptions about the environment where I tell people to reboot without understanding the conditions and I have an immediate real world case demonstrating why your statements don’t apply.
It's like you are saying that potentially dangerous tools shouldn't have safety guards whenever possible, with little impact for the common use of the tool. Kinda absurd to think that way... If some advanced use-cases require safety guards to be removed that's when the user should be trained enough to know the risks.
People want to use a computer for their tasks, the whole motto of Apple was to make technology accessible to normal people without requiring them to be tech-savvy, what you want goes in complete opposition to that mission.