As I know Pie will be the last Major OS Update for One of the best Nokia Device Nokia :6 aka The Tank.
I feel pie is not that much stable as:-
1) There's Battery Drain
2) Mic Volume is Low
3) AR Stickers in Camera App is Missing
4) No Lift to Check Phone Gesture is there in build OOAO_6_12_H
5) While Charging The Phone. Battery Protection App Recommends to Remove Charger. As it get quite hot. I am using original Nokia Charger.
It would be great if They provide a maintenance update for this device. Other Nokia Devices have received maintenance update (5.1+,6.1+,7+) with bug fixes. I hope do they do the same for This Nokia 6(2017) as well