As others mention, the Touch Bar ran on its own CPU, well, SoC. The T1 and T2 and its associated controllers were actually part of a gradual and public transit

As others mention, the Touch Bar ran on its own CPU, well, SoC. The T1 and T2 and its associated controllers were actually part of a gradual and public transition to Apple Silicon! Most people didn’t realize it at the time though. https://en.wikipedia.org/wiki/Apple_T2 https://en.wikipedia.org/wiki/Apple_T2