My first razor was a smiling square point. I had already decided that I liked near spike points and heels. After it was scaled, I didn’t like the aesthetics of the large gap between the spine and the wedge, and also how far from the end of the scales the end of the spine was. This was exacerbated by the smile, and my first razor had a smaller radius (more) smile than my present razors.
A few razors later, I extended the spine a bit for the aesthetics, and a little bit more on the next. I started to realize that the closer that I brought the contact point to the wedge, the more accurately I could control the depth that the razor sits into the scales. The blade acts as a wedge flexing the scales apart at the contact point. Because the scales are supported at the wedge, the scales are effectively stiffer there. Eventually I extended the spine far enough that the contact point could actually be at the wedge, taking scale flex totally out of the picture. By not having to have a thinner wedge to compensate for the bow a wider space can be used, minimizing inadvertently running the edge into a scale when closing the razor.
After a few more razors, this became a signature shape.