There's an OS you might like. It has no UAC, no file permissions, no sudo nor chmod, as it has no multi-user support, no antivirus and no firewall, no protection rings, not even spectre/meltdown mitigations, and most of all - no guard-rails whatsoever: You can patch the kernel directly at runtime and it won't even give you a warn. And yet, it is perfectly safe to run. It's called TempleOS and it achieves such a flawless security by having no networking support whatsoever and barely any support for removable media. If you want a piece a software - you just code it in, manually. You don't have to check the code for backdoors if it's entirely written by you... only for CIA at your actual back door...