Google has also added few security enhancements including a feature with ability to lock your phone down and prevent it from being unlocked with your fingerprint/smart lock/biometrics. Well, the good news is you can still get that Lockdown feature without having the Pixel or Pixel XL.
Lineage Community has added a similar feature to the latest LinageOS 15.1 build which is based on Android 8.1 Oreo. It is now available for LineageOS users with the most recent weeklies update.
As of now, the Official LineageOS 15.1 is only available for a few Smartphones.
Official LineageOS 15.1 Update List: Which Phones Will Get the ROM?
The Lockdown feature prevent your Smartphone from being unlocked with your fingerprint/smart lock/biometrics and you can only unlock it using the password, PIN or pattern.