I feel the same about my Kindle... but also have yet to pull the trigger on anything else. I've eyed some Boox ones, they have a million options from Kindle to tablet formfactor, including color, and they run Android so easy to do newspapers, magazines, feeds, ..., but I also find it hard to justify when my Kindle still works kinda fine. Ugh
Indeed, I had a Kindle Oasis refurb model, and it appears they've now retired it. Best kindle for me, and at $200ish didn't need to be great tech.
I liked the form factor better than paper white, because the margin had space for your hand to not accidentally touch-advance the page, plus the physical page turn buttons.
So if my Oasis dies, I'm left with the $400 scribe that is a price point I care if its good, or $150 paperwhite which I already know I dislike the form factor!
Also I at this point I have a mental block on spending more than $250 for any Kindle after years of dealing with their mediocrity.
So I'd rather take a spin with a new device from a new company than hope this time after nearly 20 years Amazon really figured it out...