It depends on what quality you need on the resulting surfaces. But it’s all about making a good foundation for the rest of the house (the final surfaces in this case). The control points will influence the “structure” of the final surface(s). You can also think of how framing a house can influence the quality of the surface of the final walls. A good job under the surface is a prerequisite for a good final surface.
If you try to follow the video you linked to you will find out that it is very (very) difficult to not end up with creases along the edges of the surfaces of the bonnet if you don’t follow the instructor’s advice.
It’s not a perfect metaphor, but if you have a curved bridge and build it with two beams from one direction and three beams from the other direction, it’s not going to make your life easier when connecting the beams in the middle. And if you then bend the finished bridge (which is what you kind of do when you have curved surfaces), the two bridge-halves won’t bend exactly the same, and so you would notice that something (the curvature) is changing in the joint at the middle of the bridge. Or, speaking about surfaces, you’ll end up having a big problem creating a surface without creases or even glitches between surface patches.
On a “simple” surface with no complex curvature you may get away with being less careful with the starting conditions, but high quality surfaces (like the bonnet) is very much about doing a good ground work, otherwise you are going to have big problems down the road. Like when you are building a house, make sure you create a good foundation. If the foundation deviates too much out of the tolerances, you will have to make endless adjustments when building the rest of the house.