Honestly, I’m baffled by the tablet market. Everyone puts out underpowered devices. Even Google! How can you, in good faith, justify a tablet having a slower processor and less memory than a phone while trying to advertise it as the superior device, perfect for editing and whatnot?
Jailbreak them!
Once you have KOReader installed, you’ve got your perfect use case out of them, you don’t need to do anything more than that.
Cool thing about KOReader, you can have it sync to a folder on your computer, so if you… acquire an ebook you just put it in that folder, and it shows up on your kindle! There’s definitely more setup for that, so perfectly excusable if you’d prefer to just drop the ebooks on there over USB!