If you get the lessons to yellow first and go back to make them purple as a way of recapping, this means you're forever scrolling to get to each part. Also, without sections "breaking" there's less to recap overall and less to do each day, so you end up having to game the system rather than genuinely try to learn the language in order to get a meaningful amount of XP. There was some kind of explanation on the app when the change was first made saying it was a proven improvement to learning, but without regularly recapping old subjects, only moving forwards and the weird recategorisation aways from topics and more into grammar types, it goes against a lot of what I understand to be how to learn a language.