My IPP feels like a MBP when connected to the keyboard. The first time, it felt strange, but it really did work. One huge benefit is a touch sensitive screen. Drawbacks are sometimes 'large', but not usual deal breakers.
The merger of macOS and iOS is happening, and it's not as scary as it at first seemed. (Have I sold out? Am I delusional?) I can still come up with reasons for having a 'full computer', but feel for 'most people', an IPP and Magic Keyboard could/should be enough.
I'm not ready for a single device that replaces all of my computers. A bridge too far for me, now, currently.