Actually even in nature there are creatures with more then one weapon essentially Kohaku such as Scorpians (3) or Octopuses [8] or Lions (4) or cats (4). In fact biting is essentially done with Two halves of one whole. All of them are capable of using all of them at once and do so.
*sigh* OK, I have no idea why I'm still doing this, but...
No.
Scorpions do not reach out pinching and stabbing all at once in a single lunge. They typically just hold off attackers with their claws before trying to sting them.
Octopi do not use their tentacles as "weapons", they use them to pull things apart by yanking on it in multiple different directions - this wouldn't be an "eight simultanious attacks", it's using all its appendages in one action.
Cats (big or small) do not rely upon "four simultanius attacks with their claws". They mostly rely upon their jaws to grab onto the enemy, and drag them down and go for the jugular, using their claws only to help grapple. If they are not grappling, and are using their claws, they are probably making a one-pawed swipe. If they are grappling and are using their claws, it is typically an alternating rear-leg kick (raking), which is, again,
alternating.
For
Then you also have to factor in that not all blows have the be the most powerful blow to be the most effective blow possible.
example if I lunged at someone with all my strength with a knife I would do just as much damage to them as if I simple used my arms. I cannot do more then 100% and neither can monsters.
I'm actually very confused as to if this even is supposed to have a meaning, but I'll take my best guess and assume that what you are saying is that there is the same momentum in a punch as there is in a stab with a knife.
The (really, really obvious) problem with that is that, again, the amount of force generated in the impact may be the same, but the area that said force is applied over is much, much narrower when you use a knife, ensuring that a knife will
penetrate the body, while a punch will simply bruise, because the specific area taking the blow will be unable to distribute the pressure applied upon it.