FrogReaver
The most respectful and polite poster ever
I have, sort of.
Remember, a +1 weapon has the same rarity as Gauntlets of Ogre Power (more important if your game allows item crafting or item purchasing I suppose).
A +2 weapon has the same rarity as a belt of hill giant strength (Str 21)
A +3 weapon has the same rarity as a belt of fire giant strength (Str 25) or Stone/Frost giant strength (Str 23)
So your high end Fighter with 2 +3 weapons has nearly as much gear as a fighter with a +3 greatsword and a belt of fire giant strength
That's fine but not really the point I'm getting at. You are looking at balancing around expected magic items. I'm saying what if the balance point has already been around having a +1/+2/+3 weapon in tiers 2/3/4 and that's what makes us look at TWF as sucking. The numbers actually map out very well if you factor in basic magic weapon bonuses in those tiers.
So, lets say our fighters are above 11th level (we're giving them two very rare items after all).
Two weapon fighter has 4 attacks at +12 to hit and 1d6+8 damage (46 potential). Greatsword fighter has 3 attacks at +13 to hit and 2d6*+9 (52) and an increased chance to hit, or 3 attacks at +14 to hit and 2d6*+10 (55).
No, according to my theory they would both have +2 magic weapons. The TWF would do 1d6+7 with 4 attacks and the GWF would do 2d6+7 with 3 attacks. They would have the same chance to hit. Damage would be identical at 42 (the GWF would have a +1 ac bonus in comparison).
TWFing starts out better than GWFing for a Fighter until 5th level, falls behind but is okay from 5th to 10th, and then dies at 11th.
Not if you factor in +1/+2/+3 magic weapons
Paladins are okay, especially if they can get the style, because of the way Improved Divine Smite works.
Paladins are fine with it even without the style - it's simply a way to increase NOVA potential at the expense of slightly lower daily damage (until you hit level 11 and gain divine smite)
Balancing TWFing would require more changes (like going in and changing how Hunter's Mark/Hex work) than many are prepared for.
Maybe 6E will get it right. Or a few of us will get off our butts and put together D&D Tactics.
Seriously take a look at all the classes with a +1/+2/+3 and get back to me. Throw out all magic item assumptions. Just look and see if the fighting styles are balanced on a per class basis at that point. You'll be surprised how close it is.