Comment by thaumasiotes

> The reason traditional material doesn't attempt immersive techniques is because it is much much easier to print a static book than it is to produce interactive and adaptive content.

No, that's not correct.

First off, you can provide immersion with static books. A common favorite here on HN is Lingua Latina per se illustrata ["the Latin tongue explained by itself"].

Second off, there are two reasons that traditional material doesn't do this. The biggest one is student demand; people are afraid of immersion. The second is that the traditional approach is faster. It's lower quality, and it tops out well below the level you hope to reach, but it's faster, not slower. It takes babies a year to learn to say they're hungry. It takes an elementary school class studying a foreign language less than a day.