The EV manufactures have to agree to standardize a removal battery pack that all cars can use and replace in a matter of minutes.
I really don't think that's a concern. Considering that a typical EV battery weighs around 1,000 pounds, there's no way you can replace it yourself. You'd have to take it to the dealer and let them do it.
Since these days you have to make an appointment to take the vehicle in (dropped mine off this morning after making an appt. a week ago) they're going to have it all day no matter how fast it takes to replace the battery. They'll probably have to order it from a local warehouse too.