It's not my claim that they've made Netflix more entertaining, just that it's likely made it more sticky.
This kind of thinking is the problem though. Like YouTube they don't care about the quality of the experience you're having. Where Netflix might see a very satisfied customer others might see a depressed individual binging a show for the 10th time as a way to escape reality.
auto-playing trailers seem like a move to encourage people to try something new instead of rewatching the same show over and over