Great to hear! I still have one with stock ROM and I like it less and less every day. Slowly getting everything across to the GOS one.
I too have noticed significant difference in battery life between the two, stock ROM always runs out first, even if at idle.
The only adaptive feature I want is for charging, I want to be able to have the phone stop charging at a percentage determined either by me or the device for the battery health. To expand, my tablet has a battery protection feature, where if it is left plugged in, holds the battery between 40-60% for long times on the charger. The device draws until it's down to 40% and then charges back up to 60%.
I only ever charge my pixels to 80%+/- and their batteries are still going an entire day with reasonably heavy use inc. Gps
I hope to see GOS continue to do great things.
(Posted from my GOS Pixel)