Yes, but using separate banks reduces the battery bank efficiency. The larger the total bank size relative to the load placed on it, the more usable amp-hours you will get out of it. Two 200 amp-hour battery banks do not give the same usable amount of electricity as a single 400-amp-hour battery bank, given the same loads. This is the same reason batteries have a much lower amp-hour rating at the 5 hour rating versus the 20 hour rating.
I think he is suggesting what you show if all four batteries are one bank. In that case I think his idea is a good one. However if your four batteries are actually two banks of two batteries to get 12 volts, connected to the boat through a dual battery selector switch, then you would be better off that way. Multiple banks that you select manually gives more reliability and flexibility too. If you accidently kill one bank the other is still in reserve.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.