At the risk of derailing this thread, I do want to address this point by mentioning that there is a reason why the ‘Operating Systems’ category on the Privacy Guides recommendations page is positioned lower than almost all of the other categories:
The reality is that the many layers of tools you use on top of your operating system have a much greater day-to-day impact on your privacy than your operating system itself does (e.g. generally, most people would be better off doing something like switching from Gmail to ProtonMail, rather than switching from LineageOS to DivestOS).
There is another comment by @jonah in a different thread that explains a little more about this reasoning if you’re interested.