5th gen MBP with Magic Keyboard started with the 16" in 2019
Bezzle has shrunk. Body expanded ever so slightly. There's a physical Esc key.
4th gen MBP with Touch Bar started in 2016. This model removed the back-lit Apple logo.
3rd gen BMP was the Retina display in 2012
The iMac has remained unchanged for over 8 years with the late 2012 iMac. It is likely to get a redesign sooner than any MacBook by as early as late 2021.
A redesign of the any MacBook would occur after in 2022 or 2023.
As for the Touch Bar. I don't mind its omission if it means less $100. 3D Touch on an iPhone was more useful.