I hope 3Speak will implement them in the future, I am sure they will arrive with time.
Anyway, not even in my language I consume much audiovisual content, except movies and series. Everything that involves serious intellectual work I need to read to learn it. I’m old school. 🤣
It's true that it can be quicker and easier to learn stuff in written form. I like to learn as well from written than from video content but I think it's a very personal matter what works best for us :-)