You do not have 78.8 KWh of actual usable capacity. In the absolute best case when the car was brand new you had around 75 KWh.
Further, you have to take into account degradation.
For example:
My car is a 2021 LR 3. It has the very slightly smaller battery than yours, usable capacity when new was 74kWh. Original rated range was 353 miles (which is completely ridiculously impossible). Now, 3 years into use, I can only get 64KWh out of the battery. This is an insane 15% degradation after just 48k miles.
More range is always better. Always. There is no reasonable argument that we could not put a “500 mile” EV to use. “500” Tesla miles is equivalent to ~350 on the highway (which is practically the place where range matters the most), and then factoring in degradation it only gets worse.
500 miles is the number. 300 ain’t it. 300 real-world at 80mph? Now that I can get with.