Just my two cents worth: After giving it some thought, I finally came to the conclusion that what you naturally do in a non- fight scenario is the appropriate thing to do in a fight. E.g.: If you're coming in the door with your arms full of grocery bags, don't you naturally close the door with your foot? Unless a wind gust suddenly starts to slam the door, threatening to smash your toes, in which case you might switch perhaps to using a shoulder on the door.
Likewise, I'll use my hands in a fight unless it's impractical (I've been grabbed by the arms, or the opponent retreats out of arms length) and I can successfully kick or use a knee. It's an old concept in the MAs that when you use a hand strike you're standing on both feet, but when you strike with your legs, it's only the one, with the concommitant loss of stability.