Thanks for your post.
I understand the frustration with the perceived lack of progress. We have actually completed quite a few large projects in 2019, and have a couple more are close to being complete.
The most major one was changing our backend system over to the cloud. Without getting too technical about it, not having our system in the cloud was causing major development issues. Having been around since 2004 we ended up with a bit of a spaghetti junction system when it came to the code base, whereas now we are in a much better place going forward to implement a lot of the things we would like to.
A lot of the suggested changes that you are referring to revolve around the UX/UI of the site. To that end, we have just finished Stage 1 of our UX/UI project, which involved adding literal fields and notations (currently live on Rocket French and Spanish), as well as rolling out subtitles on the Interactive Audio courses (also currently live on Rocket French and Spanish). The literal and notation fields are live on the apps, and the subtitles will be early next year.
We have much more planned for next year, including addressing many of the suggestions in this post, and rolling out the notations and subtitling to all courses.