> Agreed, and more solutions should try solving a problem shots way. It’s a pretty simple formula. They work to understand something and then experience it repeatedly by reviewing it to move it long term memory.

Coincidentally, this is also a major reason why Duolingo switched to “the path” (something else that gets flak on here). Spaced repetition is now built in by default. With the old layout a lot of users would complete a level and move on in an effort to complete the tree, rather than levelling up each level in a section before moving on.