The only way to be successful with EVs is to have substantial scale and that scale needs 10’s of billions of dollars, which means public markets or huge private rounds which also means dilution. Many things that are probably unpalatable to Mr.Dyson.
For now we're constructing 2000kg wagons to move 200kg of cargo and that just doesn't seem efficient.
No one wants EVs because of the same stupid question that gets asked and answered repeatedly, "this would be great, but what do I do when the battery runs out?"