Charge / maintain T6.1 main battery with leisure batteries that are being charged with solar MPPT

What’s the reason for using a switch, can it not just be left on or is it because you have to switch it off whilst the engine is running?
I don't believe a switch is actually necessary but If you need al the power from your leisure batt or if you store you car inside without sun light this switch might come in handy. Maybe a little bit of over engineering but I like switches....
 

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