Agreed, and the sad part is the gamification - while helpful for motivation - actively works against learning in other ways. Duolingo clearly doesn't want their lessons to be actually challenging because that would get in the way of the cycle of "just smash out a quick lesson to continue your streak, then get on with your day". Learners need to embrace failure and be encouraged to spend more time with the material, but the company has been steadily and purposely moving away from that over time.