Range is one thing - what is the passenger capacity of these planes?
The reason big jets are popular is that jets burn lots of fuel, which is expensive. Bigger jets burn fuel a bit more efficiently so the cost per passenger becomes more reasonable. Big battery electric planes are likely not possible with current battery technology.
But the good news is that small electrical planes are pretty cheap and the electricity is cheap too. So, instead of buying a big Boeing to save fuel, you could buy a few dozen smaller planes, fly to smaller airports that Boeing would not even be allowed to land, and drop passengers off closer to their destinations.
Also, if your 'correct' metric were right, then everyone would walk. Does that solve the problems flying does? I don't think so.
[edit]: Also, I guess your metric explains why everyone is only taking the bus or train, and private transportation does not exist?
If electric planes are lower-maintenance, for GA purposes, they could be a lot cheaper. The hobby would go from millionaires to ordinary folks.
Electric motors don't wear out like combustion ones do.
But I guess the fact that everyone is avoiding the elementary question of 'how much can a transportation system transport' tells me all I need to know about the practicality here.