I've been using these fundamentals (calm, non-gamified, emphasis on focus & flow) for building a Mandarin language learning via chat with AI. My goal was to give the user a focused tool (i.e. chat with an AI at your level) and let them experiment & play at their own pace.
However, due to the more user-driven approach to this learning method (output-focused, user has to put in effort to chat with the AI and get feedback), there is more friction with using the tool. This isn't necessarily a bad thing - in fact, more friction can lead to more meaningful experiences. That being said, I believe the market will push tools to be low friction and low effort (i.e. gamified apps) that are focused on consumption rather than tools that require more user effort.
just my 2c from a fellow builder. if curious, check it out here! would love any feedback