So in working with and loving Google classroom for years, and now working with teams, there are a few things you can tweak to make this more user friendly. First in general, you have unnecessary steps for teachers.
You need to create a way for teachers to ask students questions without having students be able to read others responses before they write their own. This way students have a way to come up with their own thinking. In that, you need to then have settings that allow students to respond to other students posts, only after having created their own responses. Kids are responding more directly to what is being written than who is saying it. Also this should be able to be a graded assigment.
You should have a general response sections, but right now that is the chat box.