IMO it doesn't even have to be model years exactly to be more reasonable than the avalanche of erratic back and forward changes we have today. Tesla grouped AP1 and dual-motors roughly the same time, for example. That was nice. They could have easily grouped facelift, AP2 and 100 kWh battery too when all of them were ready. Instead it seems Tesla wants a product demand lever for every quarter (since they don't advertise or do public discounting), so they change a few big things every quarter and then rush, change, remove bunch of small things as well at different times to suit whatever internal production reasons they may have at different times... There is no logic and predicting it is quite difficult. I am not convinced this is the best way to make long-term happy customers. It is a very erratic environment at the moment. I would not be surprised if Tesla learns to pace themselves a little better in the long run.