Battery Positive Connection = how the extra 4 wires connect

[OldRoller]

Yes, much easier and neater to add fused circuitry for driving lights, horns, a/c, etc. It's just a simple way to unclutter the battery connections. One two or more positive busbar arrangements are available. Covers are mandantory.

Also less chance of voltage drop compared to a 'stack' of connections at the battery.

 

[jp5Touring]

OP had battery in trunk with a bit of hodge podge electrical.

Installed a busbar to clean it all up, easy fix.

 

[slowbert]

Electrically, it is good design to have reference locations for positive and negative voltage, and to home run all circuits back to those locations. At least wherever possible. 
 

This can avoid ground loops and should make debugging a bit simpler. 
 

Whether to do it at the battery terminal or a separate terminal is aesthetic. However, if you start using relays for horn, lights, fuel pump, fan, etc., it can get messy if each circuit routes back to the battery post. 
 

I did a multi post terminal like the one above to make it look cleaner.