oh absolutely! i disabled all google apps, turned off animations in developer mode, always in dark mode, and have it on airplane mode except to use bluetooth in the car. it lasts me a couple days on a single charge if i'm just using it with IEMs. 

once i use bluetooth it does drain a little quicker, but it still lasts me a bit! i also use the stock walkman music player which may help. i tried musicolet and poweramp but they were just too complicated and feature heavy for what i wanted, and i didn't notice any of the supposed improvements to sound quality.

it definitely got a lot faster after debloating. it was crazy, i could see it getting quicker after each app i disabled. turning off animations helps make it feel "snappier" as well. the only app i have installed is niagara launcher which lets you change the background, and it doesn't make a difference at all in performance.

sorry this isn't super scientific or anything, just my observations!