OBD-II was implemented to monitor emissions, but EVs don't have tailpipes.
Why don’t EVs have standard diagnostic ports—and when will that change? | OBD-II was implemented to monitor emissions, but EVs don't have tailpipes.::OBD-II was implemented to monitor emissions, but EVs don't have tailpipes.
It's ridiculous that we're only now talking about standards for electric cars (by the way, for this example, legacy manufacturers already use OBDII in their EV so it's more a "Why Tesla don't use OBDII like everyone else?" question), that should have been done as soon as they started getting popular. Sit down the manufacturers and the government together and come to an agreement on a standard for diagnostics and to charge the car, don't wait over a decade to finally do it!