For a given course, some people have reached level 25 since a long time ago and continue to score up to 200k XP or more for the same course.
Is there any value in doing that, are there still new sentences coming up or are they eternally repeating and reviewing the same sentences?
Wouldn't they be better off working on some other more advanced non-Duolingo material or with real life material like newspapers, magazines, books in the corresponding language, or starting language exchanges in this language?
In that case, what would be the optimal level from which to switch out of Duolingo? Is it "all lessons completed and at least 30000 XP i.e. level 25"?
I have the impression this is the main trap in using Duolingo, i.e. losing your purpose in learning a language and becoming obsessed with scoring high XPs instead of shifting your studies into the real world..
By the way, the level of some courses can be pretty low, and even when you have scored 200k XPs in that course you might still be in CEFR B1+ territory in my opinion.
This might also be what I hinted at when I asked about (mild) personality disorders among Duolingo users in a recent post.. viewtopic.php?t=7075-personality-disorders-on-duolingo
What do you think?