I own a Nokia 5 which I had updated to Pie. As you may know, the battery duration in Pie is way shorter than were on Oreo.
On Oreo I was getting around 7 hours of battery with intensive use and some medium gaming.
With Pie I get only around 3 hours with a medium use.
I do not mind to loose some features if I get better usability and battery duration. So, I want to downgrade to Oreo.