It doesn’t work like that there are more “denser” batteries than what Tesla uses, their density isn’t that impressive while they benefit from it its not something they are driving.
They are reducing the cost of Wh/Kg maybe but they are not necessarily increasing the Wh/Kg ratio Tesla isn’t pushing for super high density.
The cost isn’t the issue here it’s the weight a Tesla battery pack is heavy as fuck and Tesla really hasn’t worked that much on reducing its actual weight because there are easier paths to make a car lighter.
Drones use LiPos because at these scales LiIon isn’t viable.
P.S. Drones use LiPo batteries.