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Will you ever expand beyond just "Groups" for shared projects? the group is great, but this silos visibility so that every person who just needs view access has to be a full team member of every team for every project - that's nuts in anything other than the smallest of organizations.
Interesting to hear more of your thoughts on this over at https://feedbackportal.microsoft.com/feedback/forum/a1a93b69-2f1c-ec11-b6e7-0022481f8472 - the Planner feedback portal. We aren't a small organization, and as I work in support and also work very closely with the product groups and other support teams I'm in plenty of Teams, but it works pretty well for me.