I wish the new words were used in contexts/sentences. And not just "it is June", but using more creative examples. For example, if we get a sentence "we have fresh strawberries in June", we can then learn this new word and additionally learn/repeat some other nouns, adjectives, prepositions.
You're almost right in this case. In general, there are a lot of full sentences throughout the course. It's not always easy to do that, however, since there are some restrictions concerning the words we can use in each skill, especially if that skill is one of the first ones. For example, your suggestion contains the phrase "fresh strawberries", but the adjective "fresh" could not be used in the plural number, same goes for "strawberries". There is going to be a greater variety of sentences in the second tree ;)
There's a post by Dimitra under the "POPULAR" category on the Greek forum providing info on this update. Duolingo has also provided a better way of teaching the alphabet for languages not using the Latin script and we're wrapping our heads around this feature, along with adding more sentences.