This is something I've considered wanting, and I'm glad it exists, but after some thought it's absolutely not at all what I want my Kobo to do. Much like how I wouldn't bring headphones or a Bluetooth speaker with me on a hike, or a laptop with me camping, I don't even want the option of games or anything other than a good reading experience when I'm using my e-reader. I'd assume this is a redundant take, but I don't even know if my Kobo can produce sounds, and I'd like to keep it that way.

What's tricky is that although I don't want it to be an unconstrained app platform, I do want the ability to integrate with services that host my things to read. Karakeep, RSS, Google Play Books or Internet Archive, etc.. but I think that could be handled in a more narrow fashion.

I agree. One of the things I love about my Kindle is that it’s a single-use device, functionally equivalent to holding a paperback in my hands. There’s nothing to distract me or tempt me away from reading. Apps would risk breaking that spell.

Yeah, the fact that my Kindle can't do anything other than read books is its best feature. Same with my Remarkable for focused writing.

Yup. I was tempted to even just install KOReader on my Kobo so I could sync progress with my phone, but I realised I would just get distracted tinkering with it and it's meant to be my distraction-free device.