Non-licensed users: view and toggle tasks complete
Non-licensed users need to be able to at least view a project and roadmap and toggle a task complete. This would create a lot of adoption potential. Right now there is no way to share a schedule with non-licensed users. Heck...you can't even print from Project For The Web.
✔We have just announced that we are supporting read-only access for Projects & Roadmaps with an O365 license. This will start rolling out next month. You can learn more here: https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=60646
Plan 3 can work for program / project / product managers, Plan 1 for product owners taking strategic objectives into the teams, but it would be great if non-licensed team members can all have view-only access, so that everyone can see the bigger picture on demand.