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.

They could let you share your login with your family members that don't live in the same house for a start, rather than making them create their own account having to pay $8 (or whatever it is in your country) per family household on my account.

As that person said, it should be like Plex - I pay for access and then I can share it with family without an extra charge. Netflix is now costing me like $50 a month just so myself and some of my family members can watch it. We probably won't be subscribed for much longer, and will just rely on my Plex library.