Ok....so, you buy an ICE vehicle and they tell you, as you walk out the door,
“Sir, the manufacturer advises that you NOT fill the tank all the way. You’ll damage the gas tank and the engine and reduce the amount of time when you have to buy a new engine and gas tank.”
Got it.
This is not a feature unique to electric vehicles—it’s the same for your cellphone, laptop, cordless tools, etc. Charging to 100%, or charging at the wrong speed, can reduce the lifespan of any of these Li-ion batteries. This is why cellphones, EVs, and laptops all have charge controllers of varying levels of sophistication.
For the record, my Tesla’s daily charge limit is set to 90%. I only exceed that if I’m on a road trip and have a need to go higher, which is seldom.