Comment by grapheneos

Fairphones are missing many of the required features and don't provide reasonable updates. An incomplete port of GrapheneOS won't provide decent security for users. It won't have decent encryption for the vast majority of users not using a strong passphrase and it won't defend well against exploits. It will end up with an end-of-life kernel and drivers/firmware lagging far behind on updates.

MTE is required for the majority of the additional protection provided by GrapheneOS against memory corruption exploits. Nearly all remote exploits and most local exploits involve memory corruption. MTE is only going to become more important as we implement deeper integration for it.