Hey Julian I believe there is good support for tracking member-specific data in GTM+GA. However I’ve not seen a good implementation of a way to show analytics data to users as charts, counts, etc.
Also currently, there is no easy way to the the currently logged-in MemberID, so you’ll have some real challenges uniquely identifying who is logged in. You could track per-machine instead of per-user, but that will fail on multi-user systems.