I have noticed that a lot of builders focus on some part of the guitar and get it to almost to final finish stage, while other parts are still ubtouced raw wood block
I think you mean that Ricardo has not finished the neck,
while the headstock is almost done?
This is quite usual way to do it.
When building on solera (¨the spanish way¨), the sequence normally is:
1. Headstock, neck and heel (the headstock can be finished because it does not affect anything nor is it affected by anything anymore in the building process).
2. Glue the top to the neck.
3. Glue the sides.
4. Glue the the back.
5. Glue the bindings.
6. Glue the fretboard.
7. Fit the frets.
8. Glue the bridge/finishing(which one first depends on the luthier).
Shaping the neck is done after the stage 6 (after the fretboard is glued on) because it is much easier that way.
You shape the width of the neck according to the width of the fret board after it is glued on and the fretboard works as a kind of ¨guide¨ when shaping it.
Some builders shape the heel first at this stage (after 6.),
others do it in the beginning (at the stage 1),
but this more a matter of taste.