Would you say macOS, iOS, Windows are more trustable than FOSS OSes like Fuschia or ChromeOS, Android, or even QubeOS and Tails?
If not, where else ChromiumOS / Android lack (keeping in mind the embedded nature of the latter)?
How long do you think before viable open firmware / open hardware computing devices show up?
Thanks.
Because even for FOSS stuff, unless you are an expert on all levels of the stack you will not be able to assert there are some hidden exploits disguides as perfectly safe code.
And if you have to rely on third parties to assert that for you, then you will have to trush their honesty and technical skills to be able to assert such statements.
So there is only hope that all players are experts, don't do any mistakes, keep being honest, and exercise their certification for every new release for all products that make up a standard installation.
macOS has SIP.
GNU/Linux is still not there doing this out of the box.