Makes sense. Especially makes since now what the electrical engineer I had come out to quote installing electric to my 10 acres was talking about. Voltage drop
You can take this anology a little further. The battery could be thought of like a water tank on roof or small tower and the alternator like a well pump.
If the water tank has a valve at the bottom, it can supply a lot of water - but the pressure is limited and will go down as the tank empties.
The pump can supply most needs at higher pressure. It also has enough pressure to refill the tank. But once the tank is full, no more water flows into it.