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The appendix creates antibodies in very young children and it has been discovered it still serves this purpose to a degree in adults. It literally exposes the white blood cells to bad bacteria etc in the gut and boosts the immune system. Because it is exposed to quite a lot of bugs etc it can...

Kidneys contain Phenons ( spelling) that stave off many problems in the body. More renal mass, more phenons, fewer problems. Why in two's? So if one part is damaged it doesn't kill the entire mass, same reason we have two nuts.

Symmetry is a successful and therefore attractive evolutionary trait although this doesn't really follow with internal organs where it's all about fitting in what we need. Most organs are high up to accommodate the gut. This in no way answers your question.