WaniKani has the best UI for any SRS software I've ever seen, but they suffer from the old algorithm. They're guilty of all of your points and the article's fourth heading concern:
> And the idea that you’ll literally never see a card again after the last interval is terrifying, as it means you’re constantly losing knowledge.
> And the idea that you’ll literally never see a card again after the last interval is terrifying, as it means you’re constantly losing knowledge.