Without relockable bootloader you might as well disable encryption, as its possible for any attacker even for a thief to unlock your "secure" device by flashing any cracker zip.
Pixels have the most secure hardware features and they are the only ones that allow for bootloader relocking with custom os. You clearly have no idea what you're talking about.
Thas like saying "Tor users are easily fingerprinted because they are using Tor." GrapheneOS has more than 200,000 users not including the other people on the outside who also have black wallpaper (a lot).
I was talking reverse, sorry.