We've been seeing in the recent years. Many battery-saver apps (and their devs) have parted ways with the Android community. Largely because of Android's native battery configuration - which seems to have improved over the years, but also because of some funny battery optimisation levels on highly infamous OEMs like Samsung and OnePlus. OnePlus' OxygenOS 12 esp (as we all can agree) is definitely one of the them.
Been using open source gems like SaverTuner for a while now. Apps that are otherwise greatly applauded by the community stand just as ineffective on my OnePlus 7T (running on OxygenOS 12.1)
ForceDoze definitely raises eyeballs and I would NOT want it to be going down the same spiral.