Well, let's face it, ToB is not a very accurate description of any martial arts. Any.
What weapon was the weapon of choice for duels, given you didn't know your opponents weapons/armour beforehand? No, it wasn't a greatsword. No one used greatswords, unless they were mounted and charging against multiple opponents, or if their task at war was to cut down enemy spears with them. Greatswords suck. It was a quarterstaff. That's right, if you met a D&D-esque party in a world that was even somewhat realistic when it came to combat, the guy with the quarterstaff wouldn't be the mage. It would be the fighter. Or the rogue. And those quarterstaffs werent the pansy versions you see in movies, either. They were as tall as you with your hand stretched upwards with the fist open, and as thick as your wrist.
Because I know you want to ask it, go ahead. "What about dualwielding?" FUCK NO. No one in their right of mind would dualwield. First of all, if you were in an actual war and walked close enough to use both your weapons offensively, you were fucked. Infact, since you didn't have shield or enough reach to fight from behind your allies shields, you were pretty much fucked to begin with, so it sucks to be you. Then some smart-ass walked up to you clad in platemail, and let you hit him for 8 minutes straight before you passed out from exhaustion, and your two daggers didn't do a fucking thing. That's how bad they are. Also, you have a slight disadvantage, you know, because everyone's weapon is longer than yours. You take a step closer, I hit you in the head with my quarterstaff, because I use real weapons. Don't even get me started if you happen to fight some ferocious animal like a boar, because then you're super-fucked. You can probably stick your dagger into its' eye and it will kill you before it dies anyway. I mean, sure, in some situations you can keep a weapon in your off-hand. I mean, it kind of works as a shield, only it doesn't help against ranged attacks but you might disarm someone with it if they fail, but that's about it.
And you know the knights, the guys with a longsword and plate. Here you are, knighting your way when another knight comes to knight you. So you two knights just stand there and decide to duel, because that's what knights do. Duel. So you both draw your longswords and you expect an epic battle where you exchange blows, dodge and parry. Fuck that, he's going to grab your weapon with his iron gloves and grapple you, then grab his dagger and stick it through some hole in your armour. That's because he was smart enough to have a dagger, unlike you, who thought that you'd get to hit with your longsword. Well, yeah, you probably got to swing it once. And that's like the only use for the dagger, too. Apart from sticking it in someone's back when they sleep, or skinning an animal. Or I don't know, cutting bread.
What about armour, then? Everyone wears it. Everyone. If you're running around without armour, you have no life. Literally. Because you're dead. Because I just killed you. WITH MY ARMOUR. IT'S THAT AWESOME. No really, I just punch you in the face with my iron fist and you die, because you don't have a helmet. Sucks to be you. I think that longsword is a useful weapon against you, which sucks even more. Like, you know, getting killed by a longsword, a weapon designed to be handy at killing peasants and not much else.
While we're at it, let's go over some of your other combat options. Spiked Chain? LOL NO. Unarmed Strikes? How about you cut off your balls and die instead, to save us all the trouble? Flail? OHOHOHOHO. Halberd? Wait what, this was used by swiss only, ever, and you know what, there's a reason for that. Weapons that are focused on slashing but cannot pierce? AHAHHAHAHAH Go die in a fire, unless killing peasants is your priority, in which case you will be totally awesome. Remember that part of everyone is armored? Yeah.
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Now that we have that over with, can we just stop with the "lol weeaboo fightan magixx" stuff with the Bo9S and admit that D&D in general sucks at simulating combat.