In my opinion a planner even basic and a gant should be available inside the project section.
Assign task to the user that you collaborate, give a name, start date, end date, progress and you got already 90% of common needs done.
I would be happy to share more thoughs on this argument if it's going to be implemented
Yes ! that's the spirit. I totally agree
Not necessary to make a gant chart IMO but viewing would be mandatory. you don' have to invent a planner they already exist.