I must have missed something. Have no idea what your talking about.
Guessing neck angle to body?
Yes a back angle on the neck can improve playability. If the string hight across the frets cant be adjusted by the bridge or truss rod to achieve it. Than that would be the next option. The only other option being a complete fret releveling or redo. I've seen some hight priced guitars that benefited from this. Favorite material to use as a neck shim would be aluminum foil. Make it any size or thickness you need. And the neck screws cut right through it when putting the guitar back together.
There is a builder who cuts the neck thickness down to acquire the back angle and I was asking if it can also be accomplished by reducing the height of the front block instead?
The back angle is used to give a desired height at the bridge, along with the preferred string action. So if your bridge is 1/2" to 5/8" high and your strings are too high, then tilting the neck back will lower the strings, that's where the playability comes in.
Yes you can do it as you suggested, at the front block, but be mindful if you fingerboard is resting over the top of the guitar.
Hope this helps Taff
I had a similar problem with one of my builds, so I cut a degree in the trough piece were the neck mounted. That made the neck angle back to give good string height all the up the fretboard.