No actually you’re all wrong.
The ONLY model that had both external and internal models with animated doors was the TBM.
Some other aircraft do have their external model with animated doors, but the internal model still shows them in place (closed), which as you can imagine would not look right at all. There is no way of animating the doors on the inside of the aircraft without cutting them out in the model, assigning animations to them, and then reanimating every single dial etc that is in the cockpit! THEN you have to re-add all the textures, and blend them correctly so they look right.
I gave the example of the Robin above, but it could be the Cessnas or any other default aircraft. The cockpit model just doesn’t have the doors animated, which is exponentially more involved than changing things on the external model.