There is no "ideal" setting that works for everyone since we all have different driving routines.
Lithium ion batteries last longest when you cycle them around 50%. (They also last longer with shorter cycles, less heat, etc. but I am only dealing with the ideal charge percentage setting.)
That means if your commute takes 20% of your battery, you set your slider to 60% since that way you cycle around 50%. If your commute takes 30% your ideal setting is 65%, etc. But unexpected trips can happen and it doesn't really hurt to charge a bit more than necessary, but it's not ideal, according to the science.
The comment about Vancouver being an ideal climate for the batteries doesn't apply to Teslas, but it does to a Nissan Leaf. I would not have bought my Leaf if I lived in Florida or Texas since it has no thermal battery management like a Tesla, hence the Nissan class action lawsuit as a result of severe degradation, especially when charging a hot battery in a hot climate with no thermal cooling. You can almost watch the Leaf's bars fall off when doing that -- but not with a Tesla -- you can hear the cooling system rev up when charging a hot battery on a hot day to keep the batteries cool.
Tesla did it right. Nissan did a major fail.
On the rare really hot days we have here (today is one of them), I tell my wife and kids not to plug in the Leaf after driving it like they normally do, but to wait until the batteries have cooled down, and to plug in later at night when it's cooler. So far I've only lost one battery bar on my 2012 Leaf.
I didn't watch the video since it sounds like it contains incorrect information from your summary but hopefully he says if you charge to 100% you drive it right away since packing all those electrons in, and keeping them there, degrades the cathode.
Having said that, someone here said it's a car not a bomb, and not to worry or obsess over it and I agree with that. I've charged my Tesla to 100% a lot, to go to my cabin and back, but I drive it right away after doing so, and the last time I did I was at 412 km after nearly 4 years and nearly 80k km on it.
