While the Pixel 6 ushered in three years of major Android OS version updates and an additional two for security patches, that’s still nowhere near the longevity of the iPhone. Google hopes to change that on the Pixel 8 and 8 Pro with noticeably more OS updates.
I do the same at 78% on the slowest charger I can find to charge overnight.
I go months without ever charging above 80%. I have to remember to let it drop below 15% and fully charge every once in a while to recalibrate.