I totally agree, but whatever service, it should be in sync with Amtrak's arrivals and departures at EMY.
I am confident that when I ride the Amtrak coach from SFC (555 Mission) to EMY, at least the 6 train is waiting for us; and upon arrival back at EMY on the 5, the coach is waiting -- regardless of how late the train is -- to take me home to SF. In my experience, Amtrak's "Thruway Service" works perfectly for this purpose.
Charter AC Transit? Fine with me. Whatever. Just don't leave me stranded.