Privacyguides is literally an echo chamber for GrapheneOS.
In fact, almost all moderators and frequent forum users use it.
Asking questions there means receiving the obvious answer that the best thing to do is give Google your money, buy a Pixel, and flash GOS due to the fact all the alternatives are ridiculously insecure. They also often point at eylenburg web. You can see my view on that page here:
On the other hand, it’s not true that Graphene gives you always more control over apps, as it can be much better if, for example, you install Magisk (root) and disable app trackers with AppManager, which also allows you to remove a large number of permissions, several of which are hidden.
It also allows you to freeze and even uninstall system apps, something that GOS doesn’t allow.
Root also allows you to edit the hosts file to block malicious domains.
In Developer Options, you can enable global sensor deactivation or even use advanced tools such as XPL-EX (a fork of xprivacyLua) to do this individually for apps, preventing them from communicating within a profile and not even knowing which OS you are using (something that even GOS cannot do).
In other words, with a ROM like LineageOS and root, you are the system administrator; it belongs to you. With stock Android or GOS, you are a user, always under the premise of security at the expense of freedom. That is why many free software enthusiasts (not open source) prefer the option I gave to Graphene, although they do not recommend it because of the amount of proprietary software, as it goes against freedom 1 because the system is not yours.