@chibi_cute:
Whitebeard's devil fruit powers are based on area of effect. It's mainly the reason why he wasn't able to kill Akainu, nor could he destroy the Marineford building. Other than destroying the football field, even if Whitebeard did do major damage to Armstrong, then his healing factor will kick in and his nanomachines and organs will just repair themselves.
As for the steel wall thing, I doubt that there is anything advanced enough in the OP world to produce anything stronger than steel or a steel alloy. Also, Whitebeard used the Gura Gura no Mi from a distance to chip away at the building, suggesting that he wasn't able to take on the building entirely using physical force.
Conversely, Armstrong punched Metal Gear EXCELSUS apart with ease. Keep in mind that it was made out of durable nanomaterials far stronger than steel, meant to rip cyborgs and buildings apart.
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