You said only Tesla can use the supercharger though.. wouldn't other car companies want to make their own super charger? You're saying it's encrypted for Tesla so I'm understanding that only Tesla cars are able to super charge...
There is EVgo, which is the fast charge connector that Nissan Leafs use, and there is a special adapter for this to connect to Teslas. There is only one-way compatibility since nissans can't plug into tesla superchargers for fast charging.
It's ridiculous for car companies to make their own chargers, just like it would be ridiculous for each company to have a proprietary gas filler port. There needs to be commonality for EVs to take off. But here we go with betamax vs VHS all over again.
The cost is only $10K more than gasoline powered equivalent, most of that difference is currently subsidized by the government. The $80K EVs are competing with $70K gas cars, not $40K gas cars.
A Nissan versa starts at $15k, a Leaf SV Plus (200-230 miles range, and the only one worth getting) starts at $36k. They are both compact sized. The bolt is more affordable, but it's still almost $20k more than the spark.
As far as I'm concerned, buying any vehicle that costs in the $80k range is just flushing money down the toilet. Even if you get government subsidies, the depreciation will still rape you.