Wasn't the Touch Bar just a sneaky way for Apple to mess around with ARM coprocessing and other ARM-based macguffins in production?
We went from Touch Bar + T2 to Apple Silicon pretty quick. The Touch Bar was the user-facing toy to drive adoption, then they just dropped the bar and kept T2 as they built out more functions in it being taken over from Intel hardware.
https://en.wikipedia.org/wiki/Apple_T2
It's like how the iPhone Air is just a test device for the iPhone Ultra's hardware capabilities and the 16e was a device to test the C1 modem. Apple's short lived "experimental production" products.