Yeah, I meant stuff like the Remarkable. I have a Kindle Scribe. Amusingly, the scribe was not good at this at launch, but has gotten some good updates. My understanding is the Remarkable is head and shoulders better.
Certainly, I wouldn't go buy one if you didn't want it already. I did the kindle as I was happy to have a large screen kindle. :D
The problem I have with a ton of computer based sketching tools, is that I just don't sketch with a mouse that well. And doing it with the keyboard is ridiculously difficult for me. The Wacom can mostly work, but it takes a ton of getting used to having the pen detached from what you are drawing. Easier than the mouse, but still hard.