Convenience would be knowing whether the show I've queued up to watch will remain on the service, or getting warned well ahead of time if it's going to expire. Or having every season of a serialized show available or at least something showing that not all of it is on the service before you get deep into it and suddenly cut off halfway through. Or easy access to my watch history and likes, as well as more robust settings (or heck, any settings) to tailor the way content is shown so I can get a consistent user experience whether I'm browsing new shows or diving back into the next episode of something.

I think Netflix could get a lot more convenient.