I am pretty happy with GrapheneOS. Things like separate toggles for internet, or long powerbutton press foe torch are missing.
But you cannot imagine how much effort it is to maintain such a project, and their base is stable, the updates are damn fast.
First stability and security, then features.
Their core OS is minimal on purpose. I use the phone, vanadium (hardened chromium, with JIT toggle, now with adblock, completely degoogled), their attestation app, etc.
Most of the other stuff are random FOSS projects, I dont even use sandboxed play, but if I wanted to I could create a separate user profile and install it just in there.
DivestOS is doing sandboxed microG which is way more secure than unsandboxed, but still tons of effort and will break a lot.