Using realism as a main argument is retarded and it's not like it's any major buff. It's probably the "Oh, no! Someone posted something that ever slightly buffs 2h, they surely should not!"
also lol at thinking poleaxes actually should get a 2h mode.
Edit: To not be as much as of a dick:
Its like you know how to drive a car so you want to pilot a plane with your car driving licence.
Do you think the difference between a pilot and a driver license is nearly similar to that of putting both hands in one place on a sword and then putting one hand a bit further? Halfswording is also something that any real "heavy 2h swordsman" would have learnt.
Not to mention that using realism as a basis for balance is and always will be - weak and baseless, realism would deem necesarry so many changes that the game would be unenjoyable. Fun is and should be basis for balance(ing).
The examples you gave are far more drastic than halfswording, which is basically a secondary/tertiary technique which would be almost necesarry for anyone who brings a really big sword (ex2h) to an actual battle - where space could be limited. Throwing requires obviously a completely different set of skill than slashing an axe, swinging an object with 1 and then 2 hands is also quite different.
Try not to read too deep into halfswording using same animations as polearms - it's that way for best representation. Using a 2h sword with a spread out grip is nothing alike to a pike or a glaive.