> I'd love to know what the justification for replacing them in the first place was.
There were two converging factors: number one is that there was a time where it was considered a sign of sophistication / progress. Definitely a case of form over function, but remember this was the era when everything Tesla did was cool and everyone was chasing them.
The second factor is cost. Physical buttons are expensive to design, certify and manufacture (most people don't have a notion of how high the durability bar is for everything that goes into a car interior). Once you have to have a touchscreen anyway you can (theoretically) remove almost all physical controls.
There were two converging factors: number one is that there was a time where it was considered a sign of sophistication / progress. Definitely a case of form over function, but remember this was the era when everything Tesla did was cool and everyone was chasing them.
The second factor is cost. Physical buttons are expensive to design, certify and manufacture (most people don't have a notion of how high the durability bar is for everything that goes into a car interior). Once you have to have a touchscreen anyway you can (theoretically) remove almost all physical controls.