Degradation has not been an issue - down 5% in 3 years and 35k miles according to Teslafi tracking since day one delivery. I occasionally charge to 100% and it doesn't stay there long. When a storm with high wind and risk of power outage is forecast it's an acceptable "risk" just like starting a long trip. When I have left my "happy Tesla is a plugged in Tesla" during a storm, the charge handle has frozen in place, the charge door froze open or would not close properly, cycling non stop from trying to close to popping open for hours until defrosted by the sun. This old advise of always plugging in was due to the hungry S/X battery heater that will quickly phantom drain capacity. This is not an issue with the heat pump in the Y or even old 3 anywhere as much. Therefore charge before the storm, not during, be prepared and have no problems. Do whatever you want but you asked for experienced outside NE owners to share their advise.I guess that depends on your definition of battery damage. Personally, I consider battery damage to include battery degradation.. which is certainly what you should expect whenever you charge a lithium battery to a full SoC unnecessarily. Considering that there’s plenty of evidence that proves lithium batteries benefit tremendously from cycling the battery as close to its nominal voltage as possible, which would be around 50% SoC, I can’t see why anyone would want to subject the battery to higher levels of stress/degradation than necessary.
It’s no different than choosing not to redline your ICE every time you drive it or not changing your oil as frequently as is necessary....both will increase the rate of degradation... which is why it is avoided.