Destroy the silos
Right now MS has three products that do the same thing with differing levels of complexity: Planner, Project For The Web, and Project. MS would unleash incredible value if these were integrated, or better yet just combined into one product that has more options turned on as you increase features.
Project For The Web is a good step forward to making project management software interface so simple that anybody can understand it. Well done! Planner gives very basic users a way to manage tasks. Again, well done! The problem is that their functionality is so silo'd that they don't provide a good value proposition to end users: The tool for the most basic user (Planner), the intermediate user (Project For The Web), and the advanced user (Project and PWA) don't talk to each other without spending 5 to 6 figures. If they don't talk to each other then information has to be created more than once. If work has to be done more than once, people look for other solutions.
Projects succeed or fail based on execution at all levels. Stratifying this platform it is violating it's most fundamental purpose: communicating information to a team.
You're forgetting sharepoint, to-do, azure devops and teams