That's actually a very good, certainly better than the original ten essentials, way of organizing things: around functions as opposed to individual items. The Mountaineers, the organization that came up with the original ten essentials now promotes the Ten Essential Systems just as you do.

One thing I've always objected to with respect to lists is that they tell you what to bring but not why. A list organized around function (as yours is) is a step in the direction of rectifying that short coming.

HJ