I came to a similar conclusion after looking into rm2 and trying one of the similar Boox tablets. They may run android, but security and OS updates seems to be a low priority for these eink tablets.
I ended up getting an iPad Air with the pencil, and one of those matte screen protectors. The OS may be locked down, but I can still choose from a wide variety of note apps/clouds (currently use GoodNotes), and security is obviously top notch.
How is the feel of writing on the matte screen protector? I've tried the pencil on the screen and the friction and "tap tap tap" sent me back to pencil and paper.
It feels closer to writing on paper (or eink) rather than on glass. The main downside is it reduces the clarity of the screen a bit, but I find it acceptable for most media (YouTube, photos, etc.).
I ended up getting an iPad Air with the pencil, and one of those matte screen protectors. The OS may be locked down, but I can still choose from a wide variety of note apps/clouds (currently use GoodNotes), and security is obviously top notch.