I've read a couple articles like this now, and my dream device is an e-ink tablet that is programmable by handwriting. Something like Emacs crossed with the Remarkable tablet crossed with a new programming language optimized for handwriting.
I don't want VR headsets. I don't want AI voice assistants. I don't want robots. I just want this.
Sadly nobody else is clamoring for it...
The remarkable 2, especially if you downgrade the OS to the older 2.x versions, is very hackable. It runs full Linux, I followed a blog post about setting up FDE on it using go and cryptfs [1]. You can make GUI applications, people have even run XFCE, and people have fed handwriting input to another API so routing it internally shouldn't be much harder.
So yes, theoretically you can turn the reMarkable 2 into a emacs lisp machine, although it would take a considerable amount of time.
I haven't read up on the reMarkable Paper Pro, but I think the dev ecosystem for that is very much alive too.
[1] https://blog.redteam-pentesting.de/2021/remarkable-encryptio...
My friend/boss swears by his remarkable tablet.
I'd buy it if it had some aggressive OCR and could translate into a REPL
Lenovo Duet 3/5 might be of interest, Chrome tablet with detachable keyboard. I have been working in gforth longhand lately and it is great fun.