It took me a a couple of years and 3 phones before I started using Graphene OS as intended without many extra apps at all. Doing everything in vanadium without any stalkerware is far better. After nearly a year of heavy daily use, the battery still lasts two days on a charge with a decent margin of battery left by day two.
If you ever take a deep dive into the AOSP user permissions space and learn how it achieve an idiot-user "safe" environment, you'll see why everyone wants their own stalkerware user app for data mining. In a nutshell, the app dev is similar to a Linux user within their app's sandbox. They have as much or more privileges than the user in that space. Additionally the zygote launcher automatically loads most apps into memory all the time on Android to supposedly save init response time. In practice, it is a fraction of a second and completely irrelevant on human time. It's just an excuse to run stalkerware 24/7 IMO