The listing of bookings is very important when using credit card bookings. For other booking methods like free or passcode the list is not very relevant, users who booked the resource or group can see the list of users also in the user management.
Having a list of my groups / courses and a separate booking list is not understood by most users, specially not when most courses do not use the access control feature but rather the old-school course centric group enrollment process.
The list in the home should be configurable. The list for the group or course owner should only be displayed when there is actually a booking method to choose from or when there are actual bookings to display.