Because people don't like to risk having their legs chewed open? It still produces wounds, I know that. It just doesn't do the things people often attribute to it - like chewing through foes as if they were made of tissue paper. It's not got the destructive potential of an actual weapon of war like a sword - or of a tool that doubles as a weapon like the Axe.
Don't even start arguing about "weapons of war". Heres an example for you. Go outside and try chopping wood with a normal axe. It ****ing gets old really quickly and you will understand why the chainsaw was invented. A sword would be ABSOLUTELY terrible in a zombie apocalypse as even a ****ing world class athlete will get tired swinging a sword and having to pry it out of bone and zombie carcasses. One of the many "myths" about the katana is its legendary cutting power.
Real feudal Japanese war was not like anime. There was not this clean nearly instantaneous cut that bisected someone perfectly and the halves just fell away after the victim had a puzzled look on their face. Real katanas got stuck in bone and you purposefully tried NOT to chop with them. They were "cutting" instruments. You could easily disembowel someone or slice a major artery to cause someone to die from bleeding to death. This is what it is very good at.
Initially it was invented due to a "fast response" weapon being needed. They started out being worn blade facing upwards so that they could be drawn extremely quickly and perform an upwards slice all in a single swift motion. This was all based upon the fact that someone could be quickly incapacitated or outright killed through bloodloss upon severing vital arteries.
Despite its weight the chainsaw would be infinitely preferable due to the fact that you DONT have to do anything except hold it and press a trigger. You would not have to swing as I have seen my uncle cut up deer and cattle bones using a chainsaw and bone yields MUCH easier than hard wood.
They're gruesome because the chainsaw produces gruesome looking wounds as a result of how it cuts. Unlike a sword or an axe, a chainsaw doesn't so much as chop or slice as it chews.
Yes and its designed to chew through stuff that is far tougher than flesh and bone.
Muscle fiber is far thicker than lube, however.
Muscle fiber will not stop a chainsaw for even a fraction of a second. Go ask your local butcher. Muscle fiber is not some miraculous high tensile strength material. It is just bundles of proteins that would strip away and tear up easier than bark on a tree.
Chainsaws also work by tearing at the location of the cut simply due to things getting momentarily stuck in the tooth as its moving by causing a localized tear. Whenever you strain your muscle you are tearing muscle fibers due to over stretching.
I would be willing to bet that if a muscle was flexed when it was struck by the chainsaw the damage would be even more severe.
Perhaps in the Bloat's case. A FP would give a harder kick, being composed of thick skin, thicker muscle and even thicker bone.
I do agree that a fleshpound would be almost suicidal to attack with a chainsaw. There are a large amount of fatalities or injuries with loggers when environmentalists "spike" trees to attempt to stop loggers from logging in an area. They basically drive spikes into the trees and as soon as a chainsaw hits a spike the chain will break and fly back which can kill/maim the logger.
As people have mentioned the fleshpound has bits of metal all over him and even hitting the smallest piece of metal with a chainsaw can be fatal to the operator.
But yeah we cant really start an argument over what is real or what isn't as honestly all the melee weapons are completely silly.
I think the axe would be the worst offender as you probably would have a very hard time even severing an arm in a single strike unless it was up against a solid surface. So the fact that you do not have to stop and pull your weapon out of the thing you just buried it in really negates any realism arguments in the first place.
Its a game and we just have to accept the suspension of disbelief.
But I guess bottom line is, you can't talk about swords, axes, and what nought being "weapons of war" anymore. Its long been accepted that to effeciently kill an army you need firearms, ammunition, bombs, artillery, explosives, etc...
But I am sure you could go join the army and insist on using a sword, but I do not know how far you'd get.