It's about time that there be standardization in EV engineering the same way there is standardization in most consumer products. Electric lighting in a house is not a hard sell because anyone can go down to a store and buy a standard base light bulb and replace it themselves. EV battery technology should be the same way with easily accessible "plug and play" replaceable cells for batteries that are self diagnosing. The technology for this exists today but no manufacturer has the guts to give up their proprietary stance regarding repair and maintenance. Ironically, whoever would do so could probably corner the market in vehicles much like Ford did with the simplicity and high volume of the model T.