That’s a fair point. It was originally “Those that work are always…” but I lost that preface in some refactoring.

I think it’s quite obvious though why Duolingo doesnt disprove any of my points. There was and is still no pleasant, multilingual, effective language learning app on the market. For the most part, you can choose one of those (and no, I do not consider Duolingo “multilingual” in the sense most polyglots need :) )