Oh yeah the new progression system is horrible. I liked the less linear one before way better. I could work on several lessons at the same time and level them up. I would usually get 1-4 and then level the up all by 1 level and continie cycling through them until they were all at max. Now with the new system I have barely progressed at all because the app itself dictates which lesson I can do and which I cannot. So I mainly do speaking practice with a cracked app. The problem you described with legendary just happened to me yesterday with a regular 3 exercise lesson. I did 2 of them and then the next day I did the last one to finish it and half the exercises used words that were either not in the previous 2 lessons or ones I don't even remember learning. I also remember they reordered some stuff when they changed the progression system and suddenly some things I already did were locked as if I had not learned that yet and some the other way around so I struggled a bit when I had to know words I had not yet learned. There really are a myriad of problems with duolingo. I sadly will stick to it because I have not found a better alternative for learning Norwegian.