Netflix has a problem that the front page is now filled with "B-rated" rather than "A-rated" content for more money than before. The amount of content that they spent money on in the past is hardly discoverable, genre search is barely exposed in the interface. You have to rely on 3rd party sites to find links to category selections, say Epic movies based on true events... good luck finding what they have in this category in the AppleTV or Roku apps. They also don't allow to exclude content that one is not interested in, I want no superheroes, no animated stuff, no dei, etc - and yet every time I launch the app it is there front and center and I just hate this. And if I watched 2 WW2 movies it doesn't mean that's the only thing I'm interested in in the recommended section. I want to exclude producing studios as well, like Vox, let me tell Netflix what I don't like.
So if you start looking outside of their interface - why then not just finish and get the movie elsewhere?
Finally, pricing is not flexible, what if I want infrequent 4k UHD streaming on a single device - why do I pay for 4 streams as if I'm streaming 24/7? At this point, I'm better off with Netflix Pay Per View (if this was offered). I keep paying for this service just because I can and just because I might watch something - but I find it more and more frustrating to watch something...