ORIGINAL: Rodney
As Post #10 above shows, it is not good practice to have any connector buried where it is never or seldom exercised. Even the gold plated one can increase in impedance and cause servo jitters or malfunction if never excercised. If you do not occasionally unplug/plug the connections, you are safer with a soldered in extension.
Very often, servos in wings need extensions in order to reach the hole in the center of the wing. I generally Shrink Wrap those connections and leave them that way for years without issue.