It's not wrong at all. Linux/UNIX has been this way for decades. What you're doing will just cause reduced battery and severe performance problems. Did you even read the link I posted? this used to be argued daily on these forums. Heck, I once was in your exact position--wouldn't take any advice given here, and assumed having a task killer and battery optimizer was a good thing. I wanted to be 'in control' of my device to an extreme. You know what? It bit me and I realize what I was led to believe was all wrong and I just stop worrying about what is running on my phone. My phone is 11 years old and still works.
Android is designed, much like Linux and UNIX before it, to fill the RAM up with the most commonly used tasks based on an algorithm that 'learns' which apps you use the most, in order to make loading those apps and services faster. If it needs extra RAM for say a game or other app, it removes those running services/apps on its own (it's called the OOM, or Out of Memory service) on demand, without you needing to do anything.