This is not an issue in my opinion, there are ups and downs to each weapon. If we remove all of the downsides to weapons it's an overall change in balance. That aspect of a small weapon's strength would be gone. There would be no advantage to moving into a tight corridor to fight a player(s) that wield huge polearms. Or using footwork to make groups of enemies crowd each other, allowing you to survive.
With this change, you're just going to have a huge group of lemmings swinging weapons all over without a care in the world. There would be no demand for player accuracy or awareness of their environment. I can see where this would frustrate newer players, just like it frustrated me. But after becoming very familiar with each aspect of the game you begin to see the necessity of it, and actually start enjoying the challenge behind mastering it. These difficulties existed in massive medieval combat. This is why the game is so simple, yet so deep. It's why it is the game we love to hate.
This would be a bad change.
...because real warriors aren't morons to put a weapon in such position where it would get stuck or collide with something behind them.
Exactly what I'm trying to get at, players don't start off as amazing warriors.