4. ms project has tasks but is for heavyweight full time project mangers, not tasks like the rest of these which are more like knowledge management action items
5. IDK about MS planner
6. MS loop is an enumeration of teams's groups + todo tasks + other integrations squeezed into a single UI by doing integrations, like in the old OLE days (https://en.wikipedia.org/wiki/Object_Linking_and_Embedding) AFAICT, while leaving actual chats / meets to teams as you said
Soon, Office Xbox 360 Series is where you will spend your break periods, for your health and also future leveraging of the "gamification" concept. Your call center is now a literal AI-integrated game in Xbox, with achievements. Play Recruiter Storm with new LinkedIn Live, and also Uber Crazy Taxi with real-time payout support from Microsoft Pay.
So now for projects there is Teams, Planner, Project, Tasks, To-Do and now Loop?
I guess Loop is like a wiki/documentation and a planner/tasks app rolled into one. And then Teams for chats and meetings?
I WORK in 365 all day, and I'm confused!