Current 2H stab is weird, and with the new turning speed nerf, extremely hard to use in most situations. Polestab on 2H is extremely nice once you get used to it. The short range means you can facehug and stab right through your target without needing to turn. It's a fantastic surprise move, and is very hard to block. Giving all 2H this ability would, if anything, be a buff.
2H stab could use some work to make it easier to use, but without quite the range it has. However, a new animation would be needed for this, not polestab.