A while ago we had some threads about ISTR Xantrex saying in their manuals that you had to fuse to the battery shorting ?? That led to questions of how much was that and where to find the battery spec that told you that, and whatever it was would be a ridiculously large amount.
All that soon faded away and we got back to the usual idea of having a fuse big enough to handle normal current and to blow if current got higher instead of the wire melting.
Yes, good point on the battery to buss wire being able to handle the total amps of all the branch wires to that buss.