Gammadoodler
Hero
Enh..in fairness.."just a guy who fights well" is not the billing..This is just naked question begging if you're going to preclude answers for irrelevant reasons.
A lot of people - obviously - prefer game worlds where people are people, unless the supernatural intervenes on or through them. If the fighter is billed as "Just a guy who fights well" then he ought to have the sorts of limitations that come along with that.
Notice how no one makes this argument about paladins - because they're not JUST "guys who fight well" - they are to a significant degree supernatural.
It's "fantasy guy in fantasy world who fights fantastical creatures in fantastical locales well (some might say fantatically well)".
The "just a guy.." stuff is inferred (IMO) unnecessarily.