Spotify is the same with whatever crappy playlists and podcasts they want you to listen.
YouTube doesn't even bother showing results that you searched past the 10 or so results, it's "content you might like" which is crap and unrelated to anything I've watched, 100% of the time.
Netflix, especially Netflix back then, is highly reliant upon in-product recommendations because if people sought out specific pieces of media they’d often find that Netflix didn’t have it.
I think it really falls down on Netflix because it doesn't have anything good to recommend to you 90% of the time. Doesn't matter how good your recommendation algorithm is if your catalogue is 90% dross and the user has already watched the remaining 10%.
My question is: how do you discover new things that you might like even more?
I think about this more in terms of music than movies, but maybe it applies to many media.
Some people will listen to Aerosmith and The Eagles until they die. They do not need media discovery. But how do new artists find an audience and how does that audience find new artists?
Recommendation engines suck, but is this a failure of current implementations, or something more fundamental?