I can't tell if this is sarcasm or not. While combat doesn't stop roleplaying I find roleplaying itself to be incredibly close to method acting (I don't do accents when I can avoid them, just too difficult for me). Roleplaying is certainly easier when you're able to talk for your character (I suspect even easier when LARPing, although I don't have the experience to tell), which is why I've played in quite a few games where rounds were lengthened to 30+ seconds (allowing everyone a decent chance to speak in character each round).
At it's core roleplaying is literally what the name describes, playing a role. At least to me this is much more about how the character talks than how they fight, and I very much enjoy using method acting in this (although I know people who don't and are just as good or better roleplayers than I am). I'm a firm believer in more talk before the have starts, I'm much more likely to try and run a mystery campaign than an explorative one, and highly likely to include at least primitive firearms.