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As you already mentioned in your question, dirt and moisture. A finish makes it easier to wipe dirt off, and prevents it getting into the wood. It also vastly slows the uptake of liquid water and h...
Answer
#1: Initial revision
As you already mentioned in your question, dirt and moisture. A finish makes it easier to wipe dirt off, and prevents it getting into the wood. It also vastly slows the uptake of liquid water and humidity (though any claims that it prevents changes in moisture due to humidity are generally false - it slows down the changes, it does not fully prevent them.) And if you keep "cleaning" the dirt with sandpaper, the shape and size of the wooden object change, as you are removing the dirt, and the surface of the wood around the dirt, to expose new wood that hasn't got dirt on it - yet.