Isn't the whole point of Kindle (or other ebook readers) being able to read books without distractions?
There's a contingent of enthusiasts who, once they find out a device runs Linux or can run Linux, seems determined to expose a terminal on it. I don't know why someone needs to SSH into their toaster, but damned if they're not gonna do it, just because they can.
Me personally, I just want a reliable toaster.
In my personal experience, this can help in case the books are little technical and you have to switch to my laptop/mobile to get more information about the topic, which ends up consuming more time it should.
Some people came for the compact package containing an eink screen, a moderately powered application board, and a reasonable amount of battery and storage. For some, it may be the perfect thin client.
That's what I want from my e-reader device too. Yet being able to turn a $140 e-ink tablet into a general purpose tool is really neat.
I went through a whole design phase with ChatGPT on the idea of using an old Kobo as a low-distraction TV remote for my dad. The idea is that it would interface with a computer media server thing, be more legible than a traditional remote, and not be an app on his phone that would immediately send him into his phone.
Ended up being more involved than the benefit it would bring, especially considering that these media server programs know how to interface with the traditional remote over HDMI (if you have the right graphics card or a dongle) and show the selection UI on screen like a smart TV.
Anyway, my response is "you don't necessarily have to complicate your e-reader, instead you have the option of making it not an e-reader."