You have a really bad attitude about this and seem to want to be angry and insulting. I am telling you what the scientific data says about this. If you disagree or don't like what the information says, you are welcome to read up on it.
No--I already told you. This is
not my opinion.
Interestingly enough, Elon Musk and Jeff Dahn, the world renowned expert in lithium ion batteries who works for Tesla now
DO recommend lower than 90%! Citation:
Tesla battery expert recommends daily charging limit to optimize durability - Electrek
Tesla Battery Expert's Recommendation For Maximum Battery Life - Video
Quote from Musk when asked about recommended charging range: "80% to 30%"
Quote from Jeff Dahn: "I would recommend charging to 70% normally. When you need a long trip, charge to 100%."
And other sources:
How to Prolong Lithium-based Batteries - Battery University
Here's the truth behind the biggest (and dumbest) battery myths | WIRED UK
Fast charging of lithium-ion batteries at all temperatures
Lithium-ion degradation at varying discharge rates - ScienceDirect
http://css.umich.edu/sites/default/files/publication/CSS20-08.pdf
Pardon for not posting links to citations before. I didn't make any such assumptions. Stop being insulting and putting words in my mouth that I did not say.
They already have all of this information, as shown by Musk recommending lower than 90%. It is very common knowledge; not "my knowledge".
1. I am not worried about degradation. It is a fact of life, and I have found a pretty comfortable balance for me around 70-80%.
2. I don't feel a need to argue with people on the internet. I don't appreciate seeing people spreading misinformation, though. You just flat out said Tesla recommends 90%. I filled in more detail of why that was a partial answer that is used by sales people, but if the experts within Tesla are asked for more details, they will readily tell people that it is not ideal. It was then you who got mad and started arguing.