Battery life is main problem in phone. Android Pie did some cool things with notifications and added in some half-baked gestures, but ultimately it looks a lot like Oreo. Which looked a lot like Nougat. There are folks who hate it all and wanted to see it burned to the ground and rebuilt into something different, but Pie wasn't the update for them. But it is the update for everyone else. And that's because it addresses the single most important thing about every smartphone in the world: battery life.
We always want the battery to last longer. You can buy specific phones with ginormous batteries or secret sauce that makes a battery last longer than it should — my KEY2 comes to mind there because BlackBerry isn't ever going to tell us why it gets double the battery life of most other phones its size.
Maybe it's a Canadian military secret. Anyhoo, I was saying you can look for a phone that has a big honking battery if you want to, but most phones don't fit that mold and have smaller batteries and dedicated forums filled with people and ideas to make them last longer.
Pie changes all of that. Google is using its powerful and scary Artificial Intelligence to make the battery last longer. Google calls it Adaptive Battery, but I call it "hot damn, this is so much better". If I'm in a place with a strong signal and mind what I'm doing I can get almost three days from my Pixel 2 battery and that's with the screen on about 7 hours worth during that time. And you can cruise on over to Reddit and see folks that are getting even better numbers since the Pie update. That's downright amazing.