I've given up on arguing with people that don't think it's a fighting game. I disagree, but they're not necessarily wrong. A bit annoyed when they act like it's a bad thing. Don't remember if I've seen anybody actually do that tho. You better not be, J. >:/
Can't think of a valid argument which proves them wrong...
Boxing, Wrestling, UFC, Martial Arts, Sumo Wrestling, maybe even Sword Dueling and other such things.
Win conditions are all different in all of these yet they are all fighting. The Big Fight has always been something to culture, to put will against will.
If Fighting Games are just imitating REAL Fighting Sports then how do Fighting Games imitate fatigue?
In Boxing and UFC type of games (what you consider a Fighter: Street Fighter and such), fatigue is imitated using Health Bars. After your Health Bar goes you knock them out or kill them.
In Sumo Wrestling the objective is to knock your opponent out of the ring. The more tired your opponent is the easier it is to push him out. So how would you represent fatigue in a game this? Well with Percents. The higher percent you are, the easier it is to knock you out.
So what is a Fighter? It is simply a game based on Real Fighting Sports and even in them win conditions vary. UFC alone has many different win conditions other than Knock Out.
Now what do you mean 'Different System for Imputs'?