Yes. It is. You can *purchase* that extra capacity. So Tesla take the hit in repair/replacement fees if the battery gets nuked by fast charging/mileage use etc. They receded on their lack of warranty acceptance on that one. That was poor action from them to not accept it in the first place. But it shows, there is actual *cost* involved in giving you that "extra" capacity (most devices, phones/laptops etc, never ever ever let you have it, money or not, unless you hack the firmware).
I'm not defending them, nor do I care for them. But physically, they can choose fast and long use batteries, or slow and long life. The user/customer cannot have both.