If you had to rent your cell phone off of ma bell with no other equipment allowed on the network we wouldn't have iphones.
If roads had ford specific infrastructure like the future elon imagines we wouldn't have tesla.
A balance between interoperability, end user control, and freedom for manufacturers is how you get innovation. In the current auto market you have none of the above.
It sounds like there may even be a fully new battery option available for early Model S vehicles in the near future.
Battery replacements may be much easier to complete.
If you buy a full replacement engine (as opposed to parts to rebuild an engine), replacement is quick and easy in an ICE. In endurance racing an engine can often be replaced in less than 30 minutes. In non-racing conditions you'd do it a bit slower but it's not hard.
At the higher end of professional racing, those are custom built cars.
But for most categories of racing, endurance race cars are just regular street cars. Hondas, Mazdas and BMWs are what I've raced or crewed with.
EV batteries won’t get replaced in 20k cars anymore than engines are. You total it out at that point.