That's why GrapheneOS had this feature for a long time, but with the ability to disable it. It also allows you to set the time period after which the reboot is initiated yourself. You can go as low as 10 minutes, or as high as 72 hours.
The GrapheneOS team is working on finding a suitable OEM that would be able to release flagship hardware with security comparable to a Pixel, and GrapheneOS preinstalled.
Any FOSS Linux/Unix shell, bash, zsh, fish, tcsh, whatever, is a million times better than cmd or the early versions of PowerShell. Yeah, I know, PowerShell Core exists now, and it's even open source and cross platform, but it still sucks.
Not true. You can link it to your Unraid.net account using Unraid Connect: https://docs.unraid.net/account/link-key/
Sure, it's not perfect, but still the best option for beginners.