The amount of buffer between a true 100% and an indicated 100% differs among manufacturers. Some give a larger buffer to protect the battery and increase longevity. The same is true between a true 0 and an indicated 0 charge.I have read so much that I don't know what to believe about the batteries. I read even if you charge to 100% that the battery is not really at 100% because the useable capacity is less than the total kWh so that you cannot damage the battery. I picked 90% because I wanted to see over 200 miles on the range when I start. I don't think anyone really know the true science so I agree with you! Charge away!
But hey, it's your car and you can do with it as you like. I'm simply stating the facts of battery charging coming from 3 different EVs. It is what it is and armed with that information you can at least proceed armed with some degree of knowledge.