alt Hacker NewsHa. Oh wow. OK, I got "implementation" to hyphenate... but only once I changed the zoom level, and only for one specific exact window width. One pixel narrower or wider, and it stopped hyphenating.
So hyphenation exists in theory, but I'm just going to go ahead and say that however it's tuned seems completely broken.
Again, I think it’s very deliberate :-) Hyphenated words are slightly harder to read, so it makes sense to avoid them – maybe not as zealously, though.