Just a guess on my part but I suspect those who smash hot iron into blades start with the blade first. This is probably the same for most stick tang knives. I think there is a different way of thinking (not better, not worse) when doing stock removal vs forging. I do stock removal.
My thought process is something like this:
1. What is the function of the knife?
2. What sort of blade will best accomplish it?
3. How can the handle be made to best enable the blade do what it's supposed to do?
The blade comes first when thinking about the overall concept of the knife but when I sit down to draw up a design it's always the handle that comes first. The shape of the tang determines to a great extent the shape of the handle, at least the profile. With a stick tang there are infinite profiles the handle can take. There is certainly room to argue that a full tang has infinite possibilities also, at least up until the scales are attached.
IMHO it seems to me that there are only so many ways that you can grind a piece of metal into blade. There are exceptions though. Some styles like the kukri, the Nessmuk, parangs, and other large machete type hackers have very distinctive blades. One might argue that they are more specialized blades.
So the answer is that the blade comes first when THINKING about the overall knife, but the physical design process of drawing a picture or some such activity, the handle comes first.
- Paul Meske, Sun Prairie, Wisconsin