I wouldn't call the user experience "perfectly fine" though. It's about as "perfectly fine" for exploring the content on a phone as pasta with ketchup is perfectly fine for eating. You won't starve but you also aren't really having a good time.
Completely fine for reading purposes and mostly free of all the UX "optimizations" for ads and such.
It works, but it's not a good experience, nor is it on par with HN.
Have similar feelings about old reddit on mobile.
What it comes down to is that yeah they're better than new reddit, but that's not much of a bar to clear and if I'm going to be spending extended periods of time using a site/service the experience needs to be good not just passable.