Calling people names is bullying. There is no need for that and should not be allowed on this forum.
You have different opinion and that is okay with me. But calling people names is childish and unnecessary.
The 8 year study you are referring to is being maintained and gets regular updates. Last update of that study was mid 2019.
Here is another recent overview:
https://batteryuniversity.com/index.php/learn/article/do_and_dont_battery_tableIt was lastupdated 2018-04-10
The difference between your research and my research is that yours is based on YouTube videos and mine on research papers from trust worthy sources.
Please stop putting words in my mouth. I never said that he should keep his phone charged at 80% nor that he should carry a powerbank with him or even that it is not okay to charge a phone up to 100%. I'm done with you and this argument.