[stillold]

They created a huge buzz around it, took over a year to release and when they did so, released it to the wrong Insider ring, so everyone who was on the fast ring specifically for and waiting for it had to re-install.

I believe, without any proof, that this is why they had to redo their rings and what they meant shortly after.

Then there is everything else people have mentioned, with them being completely reliant on Amazon's store but requiring "something" where most of the apps that are on Amazon's mobile store weren't available.

[dboreham]

I ended up in the right ring to get it on ARM, and actually used it (Kindle app on Surface Pro X). But that was the only app I used. The other one I really wanted was O'Reilly Safari/learning, their e-reader. But of course the Amazon app store is going to shut down before they allow a competitor's app on there.