The Newton had an absolutely brilliant user interface, but its hardware let it down. I wish we had a device similar to the smaller Remarkable tablet, running something like NewtonOS.
(Related: Columbo's Mystery Capers is an amazing and hilarious game from one of the Zork devs that has never been dumped and doesn't exist on any other platform. I hope someone will figure out how to get it off an actual Newton and get it to run on Einstein.)
Rather miss the notepad-central-UI --- I'd take more notes on my Samsung Galaxy Note 10+ if it had a similar facility for writing and scheduling and so forth.
I hope sometime this can be added to Infite Mac https://infinitemac.org/