Only writing in the Esperanto course? Why? :/
Because unlike other courses, Esperanto and Irish don't have TTS speakers (Text-to-Speech), but have recordings of real people saying sentences in the languages. This also means that there are a limited amount of sentences that could be used for "listen and write" exercises.
I'm not sure why they couldn't include at least those sentences that they have recorded for those exercises, by a theory could be that they didn't want to accidentally have learners "memorize sentences" rather than learn and understand what and how each of the words in the sentence means and works. But that's just my theory.