Assuming all wiring sizes and buss bars are correct.

Is there any valid reason that the positive battery feeder wire coming from my alternator (after it passes through my isolator) cannot be joined with the feeder wire coming from my battery charger so that there is only one wire leaving a buss bar where they are combined and going to the positive on my battery? This will save running double wiring to all three battery banks and loading up the positive pole on each battery. Isn't this basically the same as having wires going to the alternator and the charger joined on the pole? What say you?