Like I said earlier, it would simply be bad publicity to advertise 'don't use this product to it's maximium capacity', especially since so many batteries are over rated. The manufacturers really don't want you to get maximum life out of a battery either.
Yeah.
Consumer information (or lack thereof) is heavily influenced by the marketing department, who do not want prospective purchasers to be negatively influenced by statements that fully charging the car may significantly shorten battery life. Unfortunately the marketing department cannot change the laws of physics.
The big killer of electric vehicle batteries is leaving them unused in a warm climate when fully charged. No amount of intelligent battery cooling will help fix that.
I'd agree that, for a smartphone, the use value of keeping it topped up justifies sacrificing battery life, but smartphone batteries can be bought for a few pounds - on EV's, they're a large part of the total cost; replacement will cost many thousands & most informed owners are not so cavalier in their approach.