I would absolutely agree with you, Samsung could release software updates that could optimize the battery usage of their phones. I typically charge my phone at night, and let it get to 100%, but if the protect battery feature allowed for a certain percentage to be selected, it would greatly benefit many people in the community.
I had the Bixby Routine set to automatically turn on Protect Battery after my battery reached 95%. This morning was the first time the device had turned the routine off. Hopefully if it DOES continue to do so, it does it very seldomly.