I don't get what your point is.other than each ability each of us has being a direct result of choices made during the build process either at char-gen or at subsequent level-ups, and that those abilities either drive or inform the mechanics used to resolve said actions, I suppose you're right...
If, in an AD&D game I as GM describe a burly warrior, wearing mail and carrying a shield and a mace and then stat out that NPC as AC 3, THACO 15, damage 1d6+3, and 40 hit points, what build process have I used?
What about if I tell you a dwarf as AC 3, THACO 19, damage 1d8, and 7 hp?
The build rules don't bleed through to the stats and the action resolution at all. (One contrast I can think of: in Burning Wheel a character's lifepath progressions, which is a part of the build process, informs the character's possible Circles.)