I understand why you want to keep the feel the same. But the idea of braking, just to simulate the feeling of regenerative braking, flies in the face of what Tesla is doing from an efficiency standpoint. You're suggesting that instead of coasting, the car should brake, just to provide a consistent experience for when the driver takes his or her foot of the accelerator. While I agree there is something to be said for a consistent driving experience, it would seem in this case, the cost is just too high.
That's my opinion, anyway. Obviously others will have different ones.