Duf talked a bit about this a while ago, mentioning that gear does not usually protect us from over-torquing parts of our bodies which breaks bones, etc.
Slow speed falls seem like they would be harmless in our minds because we feel like we will just step off and all is well. Most of the time it is true, but there can be those times when our balance can be undone and we meet the ground in an awkward way.
Funny how the same subject can pop up in other places, Mike is talking about this with a riding buddy here for a couple minutes. The video is set to start there.