Honestly, the engine does not handle physics very well for very short or very long weapons.
I'm not gonna get into the "nerf 2h!" "nerf polearms!" "nerf1h" shit - they ALL have issues.
Longspears do ridiculous things, hiltslashing with 2h can allow you to swing in rather small spaces, short 1h can sometimes go "under blocks"...there's incorrect physics everywhere...to limit it to 2h just because everyone seems so wrapped up in 2h hatred still is just inaccurate.
I too wish for better collision physics ON ALL WEAPONS. Maybe in the next game.
I'll tell you what though - if that happens you wont be using longspears in gatehouses.
I'd love for people to realize that many 2h were nerfed, 1h was buffed, and nowadays you see less 2h and more 1h and polearms - I think this is good, and possibly things are more balanced than they ever have been. Shit, they even buffed archery! lol