The greatest barrier to EV adoption is the obstinance of early adopters that lack the capacity to understand why someone would use an ICE vehicle. Consequently, it hampers improvement in areas that need to be improved upon for wider EV adoption. It's quite ironic.
At least one great barrier is the reactionary response to anything associated with 'liberal', including anything that has to do with climate change. IIRC there's a correlation between politics and EV purchases. If even Musk can't persuade other reactionaries ...
