So you could get on the flight, use in flight wifi, and realise your luggage is still at the airport and spend the next few hours worrying if it will actually a

So you could get on the flight, use in flight wifi, and realise your luggage is still at the airport and spend the next few hours worrying if it will actually arrive with the plane...? Whats the point in Delta adding this functionality? Obviously in most cases it would work fine, but it seems like a complete waste of time/effort/money for them to make this. Most of the time you just assume your luggage is on the plane with you (or you are waiting for it to move from the plane to the pick up area)...